Characterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations

B. O. Demory; M. Gillon; T. Barman; X. Bonfils; M. Mayor; T. Mazeh; D. Queloz; S. Udry; F. Bouchy; X. Delfosse; T. Forveille; F. Mallmann; F. Pepe; C. Perrier

doi:10.1051/0004-6361:20078354

Characterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations

B. O. Demory
, M. Gillon
, T. Barman
, X. Bonfils
, M. Mayor
, T. Mazeh
, D. Queloz
, S. Udry
, F. Bouchy
, X. Delfosse
, T. Forveille
, F. Mallmann
, F. Pepe
, C. Perrier

Research output: Contribution to journal › Article › peer-review

84 Scopus citations

Abstract

We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-μm band of the InfraRed Array Camera (IRAC). The data spanning the predicted time of secondary eclipse show a clear flux decrement with the expected shape and duration. The observed eclipse depth of 0.58 mmag allows us to estimate a blackbody brightness temperature of T_P = 717 ± 35 K at 8 μm. We compare this infrared flux measurement to a model of the planetary thermal emission, and show that this model reproduces properly the observed flux decrement. The timing of the secondary eclipse confirms the non-zero orbital eccentricity of the planet, while also increasing its precision (e = 0.14 ± 0.01). Additional new spectroscopic and photometric observations allow us to estimate the rotational period of the star and to assess the potential presence of another planet.

Original language	English (US)
Pages (from-to)	1125-1129
Number of pages	5
Journal	Astronomy and astrophysics
Volume	475
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20078354
State	Published - Dec 2007
Externally published	Yes

Keywords

Eclipses
Infrared: general
Planetary systems
Stars: individual: GJ 436
Techniques: photometric
Techniques: spectroscopic

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20078354

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title = "Characterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations",

abstract = "We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-μm band of the InfraRed Array Camera (IRAC). The data spanning the predicted time of secondary eclipse show a clear flux decrement with the expected shape and duration. The observed eclipse depth of 0.58 mmag allows us to estimate a blackbody brightness temperature of TP = 717 ± 35 K at 8 μm. We compare this infrared flux measurement to a model of the planetary thermal emission, and show that this model reproduces properly the observed flux decrement. The timing of the secondary eclipse confirms the non-zero orbital eccentricity of the planet, while also increasing its precision (e = 0.14 ± 0.01). Additional new spectroscopic and photometric observations allow us to estimate the rotational period of the star and to assess the potential presence of another planet.",

keywords = "Eclipses, Infrared: general, Planetary systems, Stars: individual: GJ 436, Techniques: photometric, Techniques: spectroscopic",

author = "Demory, \{B. O.\} and M. Gillon and T. Barman and X. Bonfils and M. Mayor and T. Mazeh and D. Queloz and S. Udry and F. Bouchy and X. Delfosse and T. Forveille and F. Mallmann and F. Pepe and C. Perrier",

year = "2007",

month = dec,

doi = "10.1051/0004-6361:20078354",

language = "English (US)",

volume = "475",

pages = "1125--1129",

journal = "Astronomy and astrophysics",

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TY - JOUR

T1 - Characterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations

AU - Demory, B. O.

AU - Gillon, M.

AU - Barman, T.

AU - Bonfils, X.

AU - Mayor, M.

AU - Mazeh, T.

AU - Queloz, D.

AU - Udry, S.

AU - Bouchy, F.

AU - Delfosse, X.

AU - Forveille, T.

AU - Mallmann, F.

AU - Pepe, F.

AU - Perrier, C.

PY - 2007/12

Y1 - 2007/12

N2 - We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-μm band of the InfraRed Array Camera (IRAC). The data spanning the predicted time of secondary eclipse show a clear flux decrement with the expected shape and duration. The observed eclipse depth of 0.58 mmag allows us to estimate a blackbody brightness temperature of TP = 717 ± 35 K at 8 μm. We compare this infrared flux measurement to a model of the planetary thermal emission, and show that this model reproduces properly the observed flux decrement. The timing of the secondary eclipse confirms the non-zero orbital eccentricity of the planet, while also increasing its precision (e = 0.14 ± 0.01). Additional new spectroscopic and photometric observations allow us to estimate the rotational period of the star and to assess the potential presence of another planet.

AB - We present Spitzer Space Telescope infrared photometry of a secondary eclipse of the hot Neptune GJ 436 b. The observations were obtained using the 8-μm band of the InfraRed Array Camera (IRAC). The data spanning the predicted time of secondary eclipse show a clear flux decrement with the expected shape and duration. The observed eclipse depth of 0.58 mmag allows us to estimate a blackbody brightness temperature of TP = 717 ± 35 K at 8 μm. We compare this infrared flux measurement to a model of the planetary thermal emission, and show that this model reproduces properly the observed flux decrement. The timing of the secondary eclipse confirms the non-zero orbital eccentricity of the planet, while also increasing its precision (e = 0.14 ± 0.01). Additional new spectroscopic and photometric observations allow us to estimate the rotational period of the star and to assess the potential presence of another planet.

KW - Eclipses

KW - Infrared: general

KW - Planetary systems

KW - Stars: individual: GJ 436

KW - Techniques: photometric

KW - Techniques: spectroscopic

UR - https://www.scopus.com/pages/publications/36549012246

UR - https://www.scopus.com/pages/publications/36549012246#tab=citedBy

U2 - 10.1051/0004-6361:20078354

DO - 10.1051/0004-6361:20078354

M3 - Article

AN - SCOPUS:36549012246

SN - 0004-6361

VL - 475

SP - 1125

EP - 1129

JO - Astronomy and astrophysics

JF - Astronomy and astrophysics

IS - 3

ER -

Characterization of the hot Neptune GJ 436 b with Spitzer and ground-based observations

Abstract

Keywords

ASJC Scopus subject areas

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