Follow-up observations of the neptune mass transiting extrasolar planet HAT-P-11b

Jason A. Dittmann, Laird M. Close, Elizabeth M. Green, Louis J. Scuderi, Jared R. Males

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We have confirmed the existence of the transiting super Neptune extrasolar planet HAT-P-11b. On 2009 May 1 UT, the transit of HAT-P-11b was detected at the University of Arizona's 1.55 m Kuiper telescope with 1.7 millimag rms accuracy. We find a central transit time of Tc = 2454952.92534 ± 0.00060 BJD; this transit occurred 80 ± 73 s sooner than previous measurements (71 orbits in the past) would have predicted. Hence, our transit timing rules out the presence of any large (>200 s) deviations from the ephemeris of Bakos etal. We obtain a slightly more accurate period of P = 4.8878045 ± 0.0000043 days. We measure a slightly larger planetary radius of Rp = 0.452 ± 0.020 RJ (5.07 ± 0.22 R ) compared to Bakos and coworkers' value of 0.422 ± 0.014 RJ (4.73 ± 0.16 R ). Our values confirm that HAT-P-11b is very similar to GJ 436b (the only other known transiting super Neptune) in radius and other bulk properties.

Original languageEnglish (US)
Pages (from-to)L48-L51
JournalAstrophysical Journal
Issue number1 PART 2
StatePublished - 2009


  • Planetary systems
  • Stars: individual (HAT-P-11)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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