Arthur H. Healey, J.
This appeal arises from the judgment of sentence imposed in connection with the [486]*486defendant’s rape of a fourteen year old girl in Walling-ford on May 21,1979. On October 4,1982, the defendant Ronald Sutton was found guilty by a jury on each count of a three count information. The first count charged the crime of sexual assault in the first degree in violation of General Statutes § 53a-70 (a);1 the second count charged the crime of kidnapping in the second degree in violation of General Statutes § 53a-94 (a);2 and the third count charged the crime of threatening in violation of General Statutes § 53a-62 (a) (l).3 On October 5,1982, the defendant was sentenced on the first count to a term of not less than seven and one-half years nor more than fifteen years, on the second count to a term of not less than seven and one-half years nor more than fifteen years with the sentence on the second count to run consecutive to that on the first count and to a sentence of one year on the third count to run consecutive to the sentence on the first and second counts. The judgment stated that an effective sentence of not less than sixteen years and not more than thirty-one years was imposed.
[487]*487On October 5, 1982, the defendant appealed to this court. He frames the issue on appeal in this fashion: “Did the imposition of a more severe sentence on the Defendant following his reconviction after he successfully challenged his first conviction fail to comport with the requirements of North Carolina v. Pearce, 395 U.S. 711 [89 S. Ct. 2072, 23 L. Ed. 2d 656] (1969), and deprive the Defendant of liberty without due process of law in violation of the Fourteenth Amendment to the Constitution of the United States?” The defendant is challenging not his underlying conviction of October 5,1982, but rather the sentence imposed on account of that conviction. He argues that this sentence should be vacated and that the case should be remanded for a resentencing proceeding comporting with North Carolina v. Pearce, supra.
The factual background pertinent to our disposition is the following. On July 7,1981, the defendant pleaded guilty under the Alford,4 doctrine to the same three charges of which he was later found guilty by a jury on October 4,1982. At the time of the July 7,1981 plea, the trial court, Reynolds, J., after an extensive canvass, indicated that it intended to impose an effective sentence of not less than seven and not more than twelve years in prison, and, ordering a presentence investigation, it continued the matter for sentencing to August 14,1981.5 On the latter date, the trial court did sentence the defendant on the first count charging sexual assault in the first degree to a term of not less than [488]*488seven years nor more than twelve years, on the second count charging kidnapping in the second degree to a term of not less than seven years nor more than twelve years, and on the third count charging threatening to one year. It ordered that all the sentences were to run concurrently for an effective sentence of not less than seven years and not more than twelve years.6
Thereafter, on November 30, 1981, the defendant filed an application for a writ of habeas corpus.7 Sutton v. Warden, Superior Court, judicial district of Hartford-New Britain at Hartford, Docket No. 266428. The sole ground alleged in the application for the issuance of the writ was that “[the defendant’s] imprisonment is illegal in that the minimum terms of his sentence [of August 14,1981,] for sexual assault in the first degree and kidnapping in the second degree are more than one-half of the maximum terms imposed for those crimes, in violation of Conn. Gen. Stat. § 53a-35 (c) (2).”8 The prayer [489]*489for relief requested that the habeas court “issue an order declaring his sentences for sexual assault in the first degree and kidnapping in the second degree null and void . . . (Emphasis added.)
On March 15,1982, a hearing was held on the defendant’s application for a writ of habeas corpus at which the defendant, his defense counsel and assistant state’s attorney Michael Dearington, were present. At the outset, the defendant argued that the sentence should have been not less than six years and not more than twelve years rather than the sentence imposed of not less than seven nor more than twelve years because the sentencing statutes provided that the minimum sentence imposed could not exceed one half the maximum. Admitted as an exhibit, the affidavit of the defendant’s attorney at his August 14, 1981 sentencing recited in part that the defendant “plead [sic] guilty upon the understanding, inter alia, he would receive an effective sentence of seven to twelve years to serve.” (Emphasis in original.) The state argued that it felt that the habeas court, N. O’Neill, J., did not have “the authority to change sentences” and that the matter “should be either referred to Sentence Review or he should be allowed to withdraw his plea, and we start from round one again.” The defendant himself responded that “[t]hat would be fine with me.” The state said that it had no objection to going to the sentence review division but also said “I’m not sure what [490]*490the petitioner is asking for.” A colloquy ensued,9 with the court, the defendant and both counsel participating, during which the withdrawal of the defendant’s guilty plea and a new trial became focal. The court, [491]*491defense counsel and the state then all expressly warned the defendant that if he chose to withdraw his guilty plea and have a new trial, the risk of incurring an increased sentence existed if a guilty verdict were returned. Although the defendant stated that he understood “that,” the court said it would delay its decision until it was informed that the defendant’s attorney had conferred with him and had, in writing, notified the court that the defendant wished to withdraw his guilty plea. Upon receiving a “positive statement” to that effect, the court said that then “I’ll grant the motion to withdraw the guilty pleas and erase all the prior elections.”
On March 22, 1982, the defendant’s counsel wrote to the habeas court stating that he had spoken to the defendant, and “warned him that he would open himself to the maximum sentences for the crimes charged, and that there is a possibility of receiving a term of imprisonment substantially longer than the original [492]*492sentence,” but that the defendant “indicated to me his desire to go ahead with a new trial.”10 The defendant’s counsel also enclosed with that letter the defendant’s affidavit “to that effect,” which, inter alia, acknowledged his attorney’s warning. The defendant thus swore: “I fully understand the risk involved, but have nevertheless decided to withdraw my guilty plea and [493]*493proceed with a new trial.”11 Shortly thereafter, on April 28, 1982, the habeas court issued its memorandum of decision,12 finding that the defendant’s “sen-[494]*494fences of August 14, 1981 are void . . . (Emphasis added.) There was no appeal from that judgment.
The defendant thereafter pleaded not guilty and elected a trial by jury. The six day jury trial took place in September and October, 1982, on the same three charges to which he had earlier pleaded guilty under the Alford doctrine. At trial a number of witnesses testified, including the victim, her mother, her father, her sister and the defendant.13 The jury returned and the court, Mulvey, J., on October 4, 1982, accepted their verdict of guilty on each of the three counts on October 4, 1982. The court imposed an effective sentence of not less than sixteen years and not more than thirty-one years.14
[495]*495On appeal, the defendant argues that the imposition of a more severe sentence on October 5,1982, following his reconviction after his successful attack on his first conviction does not comport with the requirements of North Carolina v. Pearce, supra, and has deprived him of his liberty without due process of law. In support of this contention the defendant argues that this case “is, for all practical purposes, indistinguishable from Simpson v. Rice,” the companion case of Pearce, decided sub nom. North Carolina v. Pearce, and that the facts of Simpson “are particularly important in the context of the instant case.” In arguing that Pearce [496]*496controls, the defendant maintains that the Pearce rule applies to defendants who have successfully attacked convictions based on guilty pleas as well as to defendants who have successfully attacked illegal sentences. He also maintains that he has not waived his due process rights. On the other hand, the state’s contention, broadly stated, is that: “Once A Defendant Knowingly and Voluntarily Withdraws15 His Plea Of Guilty And Thus Subjects Himself, His Victims, And Witnesses To Exhaustive Examination During The Subsequent Criminal Trial . . . That Defendant [cannot] Then Resurrect The Voided Plea In His Effort To Avoid The Consequences Of The Lawful Sentence Which The Trial Court Based Upon Evidence Adduced At The Criminal Trial.” We find error and remand.
Some discussion of Pearce and Rice, which were habeas corpus proceedings brought by state prisoners, is required for our analysis. The United States Supreme Court articulated the question presented by both of these cases as follows: “When at the behest of the defendant a criminal conviction has been set aside and a new trial ordered, to what extent does the Constitution limit the imposition of a harsher sentence after conviction upon retrial?” North Carolina v. Pearce, supra, 713.
In Pearce, the prisoner had been convicted in a North Carolina court of assault with intent to commit rape and sentenced to prison for a term of twelve to fifteen [497]*497years. Several years later, he instituted a state post-conviction proceeding which culminated in the reversal of his conviction by the North Carolina Supreme Court on the ground that an involuntary confession had been admitted unconstitutionally as evidence against him. He was thereafter retried, convicted and sentenced by the trial judge to an eight year prison term, which, “when added to the time Pearce had already spent in prison, the parties agreed amounted to a longer total sentence than that originally imposed.” Id. That conviction and sentence were affirmed on appeal to the North Carolina Supreme Court. He then began habeas corpus proceedings in a federal district court, which held that “the longer sentence imposed upon retrial was ‘unconstitutional and void.’ ” Id., 714.
In the companion case, Rice had pleaded guilty in an Alabama court to four separate charges of second degree burglary and was sentenced to prison terms aggregating ten years. Two and one-half years later, the judgments were set aside in a state coram nobis proceeding on the ground that Rice had not been accorded his constitutional right to counsel. Thereafter, he was retried on three of the charges, convicted and sentenced to prison terms aggregating twenty-five years. On his resentencing he was not given any credit for the time that he had spent in prison on the original judgments. Rice then initiated habeas corpus proceedings in a federal district court “alleging that the state trial court had acted unconstitutionally in failing to give him credit for the time he had already served in prison, and in imposing grossly harsher sentences upon retrial.” Id., 714-15. The federal court agreed with both of Rice’s claims.
The United States Supreme Court was thus faced with “two related but analytically separate issues” in Pearce and Rice. Id., 715. The broader one, presented by Pearce, concerned “the constitutional [limitation] [498]*498upon the imposition of a more severe punishment after conviction for the same offense upon retrial”; id., 715-16; the more limited issue presented by Rice was “whether, in computing the new sentence, the Constitution requires that credit must be given for that part of the original sentence already served.”16 Id., 716. On the issue in Rice, the court held that “the constitutional guarantee against multiple punishments for the same offense absolutely requires that punishment already exacted must be fully ‘credited’ in imposing sentence upon a new conviction for the same offense.” Id., 718-19. The court then addressed “the broader problem of what constitutional limitations there may be upon the general power of a judge to impose upon reconviction a longer prison sentence than the defendant originally received.” Id., 719. On that issue, the court held, “that neither the double jeopardy provision nor the Equal Protection Clause imposes an absolute bar to a more severe sentence upon reconviction. A trial judge is not constitutionally precluded, in other words, from imposing a new sentence, whether greater or less than the original sentence, in the light of events subsequent to the first trial that may have thrown new light upon the defendant’s ‘life, health, habits, conduct, and mental and moral propensities.’ Williams v. New York, 337 U.S. 241, 245 [69 S. Ct. 1079, 93 L. Ed. 1337 (1949)]. Such information may come to the judge’s attention from evidence adduced at the second trial itself, from a new presentence investigation, from the defendant’s prison record, or possibly from other sources.” Id., 723. However, after approving of “[t]he freedom of a sentencing judge to consider the defendant’s conduct subsequent to the first conviction in imposing a new sentence,” the Pearce court hastened to point out that “[t]o say that there exists no abso[499]*499lute constitutional bar to the imposition of a more severe sentence upon retrial is not, however, to end the inquiry. There remains for consideration the impact of the Due Process Clause of the Fourteenth Amendment.” Id.
The Pearce court declared that it would be “a flagrant violation” of the fourteenth amendment for a state trial judge to follow an “announced practice of imposing a heavier sentence upon every reconvicted defendant for the explicit purpose of punishing the defendant for his having succeeded in getting his original conviction set aside.” Id., 723-24. The “very threat inherent in the existence of such a punitive policy would,” Pearce said, “with respect to those still in prison, serve to ‘chill the exercise of basic constitutional rights.’ ” Id., 724. A defendant’s due process rights would therefore be violated where such punishment is imposed whether the earlier conviction has been set aside because of constitutional error or where a defendant has “successfully pursued a statutory right of appeal or collateral remedy.” Id.
The Pearce court then announced its rule on the due process claims: “Due process of law, then, requires that vindictiveness against a defendant for having successfully attacked his first conviction must play no part in the sentence he receives after a new trial.” (Emphasis added.) Id., 725. Both Pearce and Rice had claimed that the trial courts had imposed the heavier sentences to punish them for their challenges of their original convictions. The majority in Pearce, however, said that it was not necessary to decide whether the trial judges had in fact acted vindictively. Because “the fear of such vindictiveness may unconstitutionally deter a defendant’s exercise of the right to appeal or collaterally attack his first conviction, due process also requires [500]*500that a defendant be freed of the apprehension of such a retaliatory motivation on the part of the sentencing judge.” (Emphasis added.) Id.
Therefore, the Pearce court determined that “to assure the absence of such a motivation” it “was necessary to impose upon the resentencing judge what was later described as ‘a prophylactic limitation.’ ” 3 LaFave & Israel, Criminal Procedure (1984) § 26.1 (c), p. 176; see Michigan v. Payne, 412 U.S. 47, 51, 93 S. Ct. 1966, 36 L. Ed. 2d 736 (1973).17 “In order to assure the absence of such a motivation, we have concluded that whenever a judge imposes a more severe sentence upon a defendant after a new trial, the reasons for his doing so must affirmatively appear. Those reasons must be based upon objective information concerning identifiable conduct on the part of the defendant occurring after the time of the original sentencing proceeding. And the factual data upon which the increased sentence is based must be made part of the record, so that the constitutional legitimacy of the increased sentence may be fully reviewed on appeal.” North Carolina v. Pearce, supra, 726. This limitation recognizes that “[t]o punish a person because he has done what the law plainly allows him to do is a due process violation ‘of the most basic sort.’ ” United States v. Goodwin, 457 U.S. 368, 372, 102 S. Ct. 2485, 73 L. Ed. 2d 74 (1982), quoting Bordenkircher v. Hayes, 434 U.S. 357, 363, 98 S. Ct. 663, 54 L. Ed. 2d 604, reh. denied, 435 U.S. 918, 98 S. Ct. 1477, 55 L. Ed. 2d 511 (1978); see Chaffin v. [501]*501Stynchcombe, 412 U.S. 17, 32-33 n.20, 93 S. Ct. 1977, 36 L. Ed. 2d 714 (1973). The federal due process clause, however, “is not offended by all possibilities of increased punishment upon retrial after appeal, but only by those that pose a realistic likelihood of ‘vindictiveness.’ ” Blackledge v. Perry, 417 U.S. 21, 27, 94 S. Ct. 2098, 40 L. Ed. 2d 628 (1974); United States v. Goodwin, supra, 375. An appellant who has been successful on appeal in obtaining a reversal of his conviction cannot complain that he be subjected to a proper reappraisal of sentencing standards on remand. People v. Serrato, 9 Cal. 3d 753, 764, 512 P.2d 289, 109 Cal. Rptr. 65 (1973); People v. Hickey, 109 Cal. App. 3d 426, 436, 167 Cal. Rptr. 256 (1980).
The defendant argues that the Pearce rule applies to defendants who have successfully attacked convictions based on guilty pleas as well as to those based on illegal sentences. We have no quarrel with that contention as a general proposition but are mindful that post -Pearce pronouncements by the United States Supreme Court, as we have pointed out, state that due process is not an absolute bar to a higher sentence. We conclude that the teachings of Pearce and its progeny, which were clearly implicated in the sentencing of October 5, 1982, merited attention. In this context, we cannot accept the state’s assertion in its brief that, because the August 14, 1981 sentence “Was Void At The Defendant’s Request, The Trial Court Had Unrestricted Ability To Sentence The Defendant To Any Lawful Sentence.” (Emphasis added.)
Our disposition of this case must also consider another facet of the resentencing proceeding that we hereinafter direct. That involves the fact that the sentence imposed on October 5,1982, after the defendant’s jury trial, was itself illegal, in the sense that, as the defendant in his brief indicates, it did not comport with statutory authority. The sentences on the first and sec[502]*502ond counts of the information were indeterminate sentences while the sentence imposed on the third count was a definite sentence. The minimum term of sixteen years is more than one half the maximum term of thirty-one years in violation of General Statutes § 53a-35 (c) (2).18 This is so because the one year sentence for threatening was added to both the maximum and minimum terms and not just to the minimum.19
The defendant further argues that he “has already served his new minimum term of imprisonment, and, under these circumstances, only the 19 year increase in his maximum term presents a case and controversy for this Court to decide.”20 (Emphasis added.) The sentence imposed on October 5, 1982, was itself illegal because it was not imposed in accordance with statutory authority. The defendant himself has brought this to our attention in his brief. Despite his assertion that we are limited to reviewing “only the 19 year increase in his maximum term,” we do not agree that the matter of the minimum term is academic, and on remand the illegality of the sentence for its statutory nonconformity should be addressed. See General Statutes [503]*503§§ 53a-35 (c) (2), 53a-37. An appellant, who has been successful on appeal or has an illegal sentence vacated, should not be heard to assert that “he should not be subjected to a proper reappraisal of statutory sentencing standards upon remand.” People v. Hickey, supra, 436.
A remand for resentencing is also necessary because of Pearce. At that resentencing hearing, the teaching of Pearce requires that the defendant’s due process rights must be strictly observed. “The goal of the Pearce rule, that apprehension of vindictiveness be allayed, does not permit a defendant to be left to speculate as to the true reason for an increased sentence.” Jacobs v. Redman, 616 F.2d 1251, 1259 (3d Cir.), cert. denied, 446 U.S. 944, 100 S. Ct. 2170, 64 L. Ed. 2d 799 (1980). This is a matter of federal constitutional law.
The record of the remarks21 of the trial judge in sentencing this defendant after the jury verdict of guilty does not affirmatively disclose any “factual data,” that [504]*504are legitimate Pearce reasons for the increased sentence. Such reasons must be “based upon objective information concerning identifiable conduct on the part of the defendant occurring after the time of the original sentencing proceeding [on August 14,1981].” North Carolina v. Pearce, supra, 726; Blackledge v. Perry, supra; Robinson v. Scully, 690 F.2d 21, 24 (2d Cir. 1982). “If any doubt remained that the sentencing judge must himself articulate the basis for the harsher sentence, such doubt was dispelled by the Court’s interpretation of Pearce in Blackledge v. Perry, 417 U.S. 21, 25-26, 94 S. Ct. 2098, 2101, 40 L. Ed. 2d 628 (1974).” United States v. Tucker, 581 F.2d 602, 606 (7th Cir. 1978). The affirmative disclosure required by Pearce and its progeny to ensure the “constitutional legitimacy” of the increased sentence is not present in the record. Despite a careful examination of the trial court’s remarks at the resentencing of October 5,1982, we cannot find that the record demonstrates that the increased sentences were based on objective information concerning identifiable conduct occurring subsequent to the original sentencing in accordance with Pearce. The record does not affirmatively disclose that this was done. The resentencing judge noted that he had “sat through this trial, and listened to what took place here, and it was atrocious.” This, together with his observation that the victim, her mother, her father and her sister “had to come in here and testify,” does not comport with Pearce and its progeny, which require that the factual basis for the higher sentence, if not the literal reasons, “affirmatively appear” in the record.
It is fair to say that a full trial after an earlier proceeding setting aside the original sentence can be a subsequent event under Pearce that may, in a given case, supply data that may lend support to an increased sentence. See, e.g., United States v. Hayes, 676 F.2d 1359, [505]*5051365 (11th Cir.), cert. denied, 459 U.S. 1040, 103 S. Ct. 455, 74 L. Ed. 2d 608 (1982); United States v. Cunningham, 529 F.2d 884 (6th Cir. 1976); State v. Taylor, 22 Wash. App. 308, 589 P.2d 1250, cert. denied, 92 Wash. 2d 1013 (1979); State v. Stubbendick, 110 Wis. 2d 693, 329 N.W.2d 399 (1983). Evidence introduced for the first time at a later trial has been suggested to constitute a basis for data regarding a defendant’s conduct occurring after the first sentencing and consonant with Pearce where the record so discloses that under Pearce standards. See United States v. Hayes, supra; United States v. Cunningham, supra, 889. Of course, “amplified knowledge” about the defendant’s criminal activity which may have occurred before the sentencing of August 14,1981, but known to the earlier sentencing judge cannot serve as a basis for an increased sentence under Pearce. See United States v. Gilliss, 645 F.2d 1269, 1284 (8th Cir. 1981); Barnes v. United States, 419 F.2d 753 (D.C. Cir. 1969); State v. Stubbendick, supra; cf. United States v. Grayson, 438 U.S. 41, 98 S. Ct. 2610, 57 L. Ed. 2d 582 (1978) (perjury by defendant will support an increased sentence); United States v. Cunningham, supra. In United States v. Grayson, supra, 51, the United States Supreme Court said: “A defendant’s truthfulness or mendacity while testifying on his own behalf, almost without exception, has been deemed probative of his attitudes toward society and prospects for rehabilitation and hence relevant to sentencing.”
In light of the foregoing, we decide today to remand this case for resentencing in accordance with this opinion. On remand the sentencing judge will consider both the constitutional due process protection developed in North Carolina v. Pearce and its progeny and the statutory requirements for sentencing.
[506]*506There is error, the sentence of October 5, 1982, is set aside and the matter is remanded to the trial court for resentencing not inconsistent with this opinion.
In this opinion Dannehy, Santaniello and Callahan, Js., concurred.