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J/ApJ/689/L149 Parameter variations of Gliese 436b (Coughlin+, 2008)
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Beginning of ReadMe :J/ApJ/689/L149 Parameter variations of Gliese 436b transits (Coughlin+, 2008)
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New observations and a possible detection of parameter variations in the
transits of Gliese 436b.
Coughlin J.L., Stringfellow G.S., Becker A.C., Lopez-Morales M.,
Mezzalira F., Krajci T.
<Astrophys. J., 689, L149-L152 (2008)>
=2008ApJ...689L.149C
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ADC_Keywords: Planets ; Stars, diameters ; Stars, variable
Keywords: planetary systems - stars: individual (Gliese 436)
Abstract:
We present ground-based observations of the transiting Neptune-mass
planet Gl 436b obtained with the 3.5m 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
< 12M_earth_ in a nonresonant orbit.
Description:
We observed Gl 436 (J114211+264224) in the V filter on the nights
of 2008 April 7, April 28, and May 6 UT with the 3.5m telescope at
Apache Point Observatory (APO).
Objects:
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RA (2000) DE Designation(s)
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11 42 11.1 +26 42 24 Gliese 436b = GJ 436 b
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