Jason A. Dittmann et al 2009 ApJ 699 L48 doi:10.1088/0004-637X/699/1/L48
Jason A. Dittmann, Laird M. Close, Elizabeth M. Green, Louis J. Scuderi and Jared R. Males
Show affiliationsWe 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 et al. 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.
Issue 1 (2009 July 1)
Received 2009 May 7, accepted for publication 2009 May 26
Published 2009 June 15
Jason A. Dittmann et al 2009 ApJ 699 L48
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