Detection of thermal emission of XO-2b: Evidence for a weak temperature inversion

Pavel MacHalek; Peter R. McCullough; Adam Burrows; Christopher J. Burke; Joseph L. Hora; Christopher M. Johns-Krull

doi:10.1088/0004-637X/701/1/514

Detection of thermal emission of XO-2b: Evidence for a weak temperature inversion

Pavel MacHalek
, Peter R. McCullough
, Adam Burrows
, Christopher J. Burke
, Joseph L. Hora
, Christopher M. Johns-Krull

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

49 Scopus citations

Abstract

We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8, and 8.0 μm with Infrared Array Camera on the Spitzer Space Telescope to be 0.00081 ± 0.00017, 0.00098 ± 0.00020, 0.00167 ± 0.00036, and 0.00133 ± 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 × 10⁹ erg cm^-2 s^-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.

Original language	English (US)
Pages (from-to)	514-520
Number of pages	7
Journal	Astrophysical Journal
Volume	701
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/701/1/514
State	Published - 2009

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Binaries: eclipsing
Infrared: stars
Planetary systems
Stars: individual (XO-2)

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10.1088/0004-637X/701/1/514

Cite this

@article{83406f170ae642a18ddd0925f77904e6,

title = "Detection of thermal emission of XO-2b: Evidence for a weak temperature inversion",

abstract = "We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8, and 8.0 μm with Infrared Array Camera on the Spitzer Space Telescope to be 0.00081 ± 0.00017, 0.00098 ± 0.00020, 0.00167 ± 0.00036, and 0.00133 ± 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 × 109 erg cm-2 s-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.",

keywords = "Binaries: eclipsing, Infrared: stars, Planetary systems, Stars: individual (XO-2)",

author = "Pavel MacHalek and McCullough, \{Peter R.\} and Adam Burrows and Burke, \{Christopher J.\} and Hora, \{Joseph L.\} and Johns-Krull, \{Christopher M.\}",

year = "2009",

doi = "10.1088/0004-637X/701/1/514",

language = "English (US)",

volume = "701",

pages = "514--520",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

}

TY - JOUR

T1 - Detection of thermal emission of XO-2b

T2 - Evidence for a weak temperature inversion

AU - MacHalek, Pavel

AU - McCullough, Peter R.

AU - Burrows, Adam

AU - Burke, Christopher J.

AU - Hora, Joseph L.

AU - Johns-Krull, Christopher M.

PY - 2009

Y1 - 2009

N2 - We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8, and 8.0 μm with Infrared Array Camera on the Spitzer Space Telescope to be 0.00081 ± 0.00017, 0.00098 ± 0.00020, 0.00167 ± 0.00036, and 0.00133 ± 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 × 109 erg cm-2 s-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.

AB - We estimate flux ratios of the extrasolar planet XO-2b to its host star XO-2 at 3.6, 4.5, 5.8, and 8.0 μm with Infrared Array Camera on the Spitzer Space Telescope to be 0.00081 ± 0.00017, 0.00098 ± 0.00020, 0.00167 ± 0.00036, and 0.00133 ± 0.00049, respectively. The fluxes provide tentative evidence for a weak temperature inversion in the upper atmosphere, the precise nature of which would need to be confirmed by longer wavelength observations. XO-2b substellar flux of 0.76 × 109 erg cm-2 s-1 lies in the predicted transition region between atmospheres with and without upper atmospheric temperature inversion.

KW - Binaries: eclipsing

KW - Infrared: stars

KW - Planetary systems

KW - Stars: individual (XO-2)

UR - https://www.scopus.com/pages/publications/70449814692

UR - https://www.scopus.com/pages/publications/70449814692#tab=citedBy

U2 - 10.1088/0004-637X/701/1/514

DO - 10.1088/0004-637X/701/1/514

M3 - Article

AN - SCOPUS:70449814692

SN - 0004-637X

VL - 701

SP - 514

EP - 520

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

Detection of thermal emission of XO-2b: Evidence for a weak temperature inversion

Abstract

All Science Journal Classification (ASJC) codes

Keywords

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