|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Spitzer Observations of GJ3470b: a Very Low-density Neptune-size Planet Orbiting a Metal-rich M dwarf | | Brice-Olivier Demory
; Guillermo Torres
; Vasco Neves
; Leslie Rogers
; Michael Gillon
; Elliott Horch
; Peter Sullivan
; Xavier Bonfils
; Xavier Delfosse
; Thierry Forveille
; Christophe Lovis
; Michel Mayor
; Nuno Santos
; Sara Seager
; Barry Smalley
; Stephane Udry
; | | Date: |
28 Jan 2013 | | Abstract: | We present Spitzer/IRAC 4.5-micron transit photometry of GJ3470b, a
Neptune-size planet orbiting a M1.5 dwarf star with a 3.3-day period recently
discovered in the course of the HARPS M-dwarf survey. We refine the stellar
parameters by employing purely empirical mass-luminosity and surface brightness
relations constrained by our updated value for the mean stellar density, and
additional information from new near-infrared spectroscopic observations. We
derive a stellar mass of M_star = 0.539+0.047-0.043 M_sun and a radius of
R_star = 0.568+0.037-0.031 R_sun. We determine the host star of GJ3470b to be
metal-rich, with a metallicity of [Fe/H] = +0.20 +/- 0.10 and an effective
temperature of Teff = 3600 +/- 100 K. The revised stellar parameters yield a
planetary radius R_pl = 4.83+0.22-0.21 R_Earth that is 13 percent larger than
the value previously reported in the literature. We find a planetary mass M_pl
= 13.9+1.5-1.4 M_Earth that translates to a very low planetary density, rho_pl
= 0.72+0.13-0.12 gcm-3, which is 33% smaller than the original value. With a
mean density half of that of GJ436b, GJ3470b is an example of a very
low-density low-mass planet, similar to Kepler-11d, Kepler-11e, and Kepler-18c
but orbiting a much brighter nearby star that is more conducive to follow-up
studies. | | Source: | arXiv, 1301.6555 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER