A Caltech Library Service

A Near-Infrared Transmission Spectrum for the Warm Saturn HAT-P-12b

Line, Michael R. and Knutson, Heather and Deming, Drake and Wilkins, Ashlee and Desert, Jean-Michel (2013) A Near-Infrared Transmission Spectrum for the Warm Saturn HAT-P-12b. Astrophysical Journal, 778 (2). Art. No. 183. ISSN 0004-637X.

PDF - Published Version
See Usage Policy.

PDF - Submitted Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present a HST WFC3 transmission spectrum for the transiting exoplanet HAT-P-12b. This warm (1000 K) sub-Saturn-mass planet has a smaller mass and a lower temperature than the hot-Jupiters that have been studied so far. We find that the planet's measured transmission spectrum lacks the expected water absorption feature for a hydrogen-dominated atmosphere, and is instead best-described by a model with high-altitude clouds. Using a frequentist hypothesis testing procedure, we can rule out a hydrogen-dominated cloud free atmosphere to 4.9σ. When combined with other recent WFC3 studies, our observations suggest that clouds may be common in exoplanetary atmospheres.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Line, Michael R.0000-0002-2338-476X
Knutson, Heather0000-0002-0822-3095
Deming, Drake0000-0001-5727-4094
Desert, Jean-Michel0000-0002-0875-8401
Additional Information:© 2013 American Astronomical Society. Received 2013 September 2; accepted 2013 October 16; published 2013 November 13. J.-M.D. acknowledges funding from NASA through the Sagan Exoplanet Fellowship program administered by the NASA Exoplanet Science Institute (NExScI).
Funding AgencyGrant Number
NASA Exoplanet Science Institute (NExScI)UNSPECIFIED
Subject Keywords:planets and satellites: atmospheres; planets and satellites: individual (HAT-P-12b)
Issue or Number:2
Record Number:CaltechAUTHORS:20131104-102917314
Persistent URL:
Official Citation:A Near-infrared Transmission Spectrum for the Warm Saturn HAT-P-12b Michael R. Line et al. 2013 ApJ 778 183
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42217
Deposited By: Ruth Sustaita
Deposited On:04 Nov 2013 20:59
Last Modified:09 Mar 2020 13:18

Repository Staff Only: item control page