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Ground-based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-infrared

Bean, Jacob L. and Désert, Jean-Michel and Seifahrt, Andreas and Madhusudhan, Nikku and Chilingarian, Igor and Homeier, Derek and Szentgyorgyi, Andrew (2013) Ground-based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-infrared. Astrophysical Journal, 771 (2). Art. No. 108. ISSN 0004-637X. doi:10.1088/0004-637X/771/2/108.

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We present ground-based measurements of the transmission and emission spectra of the hot-Jupiter WASP-19b in nine spectroscopic channels from 1.25 to 2.35 μm. The measurements are based on the combined analysis of time-series spectroscopy obtained during two complete transits and two complete secondary eclipses of the planet. The observations were performed with the MMIRS instrument on the Magellan II telescope using the technique of multi-object spectroscopy with wide slits. We compare the transmission and emission data to theoretical models to constrain the composition and thermal structure of the planet's atmosphere. Our measured transmission spectrum exhibits a scatter that corresponds to 1.3 scale heights of the planet's atmosphere, which is consistent with the size of spectral features predicted by theoretical models for a clear atmosphere. We detect the secondary eclipses of the planet at significances ranging from 2.2σ to 14.4σ. The secondary eclipse depths, and the significances of the detections increase toward longer wavelengths. Our measured emission spectrum is consistent with a 2250 K effectively isothermal one-dimensional model for the planet's dayside atmosphere. This model also matches previously published photometric measurements from the Spitzer Space Telescope and ground-based telescopes. These results demonstrate the important role that ground-based observations using multi-object spectroscopy can play in constraining the properties of exoplanet atmospheres, and they also emphasize the need for high-precision measurements based on observations of multiple transits and eclipses.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle Paper
Bean, Jacob L.0000-0003-4733-6532
Désert, Jean-Michel0000-0002-0875-8401
Madhusudhan, Nikku0000-0002-4869-000X
Szentgyorgyi, Andrew0000-0002-0255-2525
Additional Information:© 2013 The American Astronomical Society. Received 2013 March 5; accepted 2013 May 28; published 2013 June 24. J.L.B. acknowledges support from the Alfred P. Sloan Foundation. J.-M.D. acknowledges funding from NASA through the Sagan Exoplanet Fellowship program administered by the NASA Exoplanet Science Institute (NExScI). The results presented are based on observations made with the 6.5 m Magellan telescopes located at Las Campanas Observatory. Facility: Magellan:Clay (MMIRS)
Funding AgencyGrant Number
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:planets and satellites: atmospheres – planets and satellites: individual (WASP-19b) – techniques: photometric
Issue or Number:2
Record Number:CaltechAUTHORS:20130809-131156435
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Official Citation:Ground-based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-infrared Jacob L. Bean et al. 2013 ApJ 771 108
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39842
Deposited By: Tony Diaz
Deposited On:09 Aug 2013 20:54
Last Modified:09 Nov 2021 23:47

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