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Improved Orbital Parameters and Transit Monitoring for HD 156846b

Kane, Stephen R. and Howard, Andrew W. and Pilyavsky, Genady and Mahadevan, Suvrath and Henry, Gregory W. and von Braun, Kaspar and Ciardi, David R. and Dragomir, Diana and Fischer, Debra A. and Jensen, Eric and Laughlin, Gregory and Ramirez, Solange V. and Wright, Jason T. (2011) Improved Orbital Parameters and Transit Monitoring for HD 156846b. Astrophysical Journal, 733 (1). Art. No. 28. ISSN 0004-637X.

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HD 156846b is a Jovian planet in a highly eccentric orbit (e = 0.85) with a period of 359.55 days. The pericenter passage at a distance of 0.16 AU is nearly aligned to our line of sight, offering an enhanced transit probability of 5.4% and a potentially rich probe of the dynamics of a cool planetary atmosphere impulsively heated during close approach to a bright star (V = 6.5). We present new radial velocity (RV) and photometric measurements of this star as part of the Transit Ephemeris Refinement and Monitoring Survey. The RV measurements from the Keck-High Resolution Echelle Spectrometer reduce the predicted transit time uncertainty to 20 minutes, an order of magnitude improvement over the ephemeris from the discovery paper. We photometrically monitored a predicted transit window under relatively poor photometric conditions, from which our non-detection does not rule out a transiting geometry. We also present photometry that demonstrates stability at the millimagnitude level over its rotational timescale.

Item Type:Article
Related URLs:
URLURL TypeDescription
Kane, Stephen R.0000-0002-7084-0529
Howard, Andrew W.0000-0001-8638-0320
Mahadevan, Suvrath0000-0001-9596-7983
Henry, Gregory W.0000-0003-4155-8513
von Braun, Kaspar0000-0002-5823-4630
Ciardi, David R.0000-0002-5741-3047
Dragomir, Diana0000-0003-2313-467X
Fischer, Debra A.0000-0003-2221-0861
Jensen, Eric0000-0002-4625-7333
Laughlin, Gregory0000-0002-3253-2621
Wright, Jason T.0000-0001-6160-5888
Additional Information:© 2011 American Astronomical Society. Received 2011 January 23; accepted 2011 March 17; published 2011 April 29. The authors thank the anonymous referee, whose comments greatly improved the quality of the paper. This work made use of the SIMBAD database (operated at CDS, Strasbourg, France), NASA’s Astrophysics Data System Bibliographic Services, and the NASA Star and Exoplanet Database (NStED). This work was partially supported by funding from the Center for Exoplanets and Habitable Worlds. The Center for Exoplanets and Habitable Worlds is supported by the Pennsylvania State University, the Eberly College of Science, and the Pennsylvania Space Grant Consortium. Finally, the authors wish to extend special thanks to those of Hawai‘ian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the Keck observations presented herein would not have been possible.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Center for Exoplanets and Habitable WorldsUNSPECIFIED
Subject Keywords:planetary systems; stars: individual (HD 156846); techniques: photometric; techniques: radial velocities
Issue or Number:1
Classification Code:PACS: 97.82.-j; 97.10.Wn; 95.85.Kr; 95.10.Eg; 95.10.Gi; 95.10.Km
Record Number:CaltechAUTHORS:20110531-153802299
Persistent URL:
Official Citation:Improved Orbital Parameters and Transit Monitoring for HD 156846b Stephen R. Kane et al. 2011 ApJ 733 28
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:23847
Deposited By: Jason Perez
Deposited On:01 Jun 2011 22:40
Last Modified:13 Dec 2019 03:44

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