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Detection of transits of the nearby hot Neptune GJ 436 b | | M. Gillon
; F. Pont
; B.-O. Demory
; F. Mallmann
; M. Mayor
; T. Mazeh
; D. Queloz
; A. Shporer
; S. Udry
; C. Vuissoz
; | | Date: |
16 May 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | This Letter reports on the photometric detection of transits of the
Neptune-mass planet orbiting the nearby M-dwarf star GJ 436. It is by far the
closest, smallest and least massive transiting planet detected so far. Its mass
is slightly larger than Neptune’s at M = 22.6 +- 1.9 M_earth. The shape and
depth of the transit lightcurves show that it is crossing the host star disc
near its limb (impact parameter 0.84 +- 0.03) and that the planet size is
comparable to that of Uranus and Neptune, R = 25200 +- 2200 km = 3.95 +- 0.35
R_earth. Its main constituant is therefore very likely to be water ice. If the
current planet structure models are correct, an outer layer of H/He
constituting up to ten percent in mass is probably needed on top of the ice to
account for the observed radius. | | Source: | arXiv, arxiv.0705.2219 | | Services: | Forum | Review | PDF | Favorites | |
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