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Title:
New Observations and a Possible Detection of Parameter Variations in the Transits of Gliese 436b
Authors:
Coughlin, Jeffrey L.; Stringfellow, Guy S.; Becker, Andrew C.; López-Morales, Mercedes; Mezzalira, Fabio; Krajci, Tom
Affiliation:
AA(Department of Astronomy, New Mexico State University, P.O. Box 30001, MSC 4500, Las Cruces, NM 88003-8001 .), AB(Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389 .), AC(Department of Astronomy, University of Washington; .), AD(Hubble Fellow, Department of Terrestrial Magnetism, Carnegie Institution of Washington; .), AE(Center for Astrophysics and Space Astronomy, Department of Astrophysical and Planetary Sciences, University of Colorado, 389 UCB, Boulder, CO 80309-0389 .), AF(Astrokolkhoz Observatory, P.O. Box 1351, Cloudcroft, NM 88317; .)
Publication:
The Astrophysical Journal, Volume 689, Issue 2, pp. L149-L152. (ApJL Homepage)
Publication Date:
12/2008
Origin:
UCP
ApJ Keywords:
Stars: Planetary Systems, stars: individual (Gliese 436)
DOI:
10.1086/595822
Bibliographic Code:
2008ApJ...689L.149C

Abstract

We present ground-based observations of the transiting Neptune-mass planet Gl 436b obtained with the 3.5 m telescope at Apache Point Observatory and other supporting telescopes. Included in this is an observed transit in early 2005, over 2 years before the earliest reported transit detection. We have compiled all available transit data to date and perform a uniform modeling using the JKTEBOP code. We do not detect any transit timing variations of amplitude greater than ~1 minute over the ~3.3 year baseline. We do however find possible evidence for a self-consistent trend of increasing orbital inclination, transit width, and transit depth, which supports the supposition that Gl 436b is being perturbed by another planet of <~12 M⊕ in a nonresonant orbit.
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