A Caltech Library Service

Non-detection of Previously Reported Transits of HD 97658b with MOST Photometry

Dragomir, Diana and Matthews, Jaymie M. and Howard, Andrew W. and Antoci, Victoria and Henry, Gregory W. and Guenther, David B. and Johnson, John A. and Kuschnig, Rainer and Marcy, Geoffrey W. and Moffat, Anthony F. J. and Rowe, Jason F. and Rucinski, Slavek M. and Sasselov, Dimitar and Weiss, Werner W. (2012) Non-detection of Previously Reported Transits of HD 97658b with MOST Photometry. Astrophysical Journal Letters, 759 (2). Art. No. L41. ISSN 2041-8205.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


The radial velocity-discovered exoplanet HD 97658b was recently announced to transit, with a derived planetary radius of 2.93 ± 0.28 R_⊕. As a transiting super-Earth orbiting a bright star, this planet would make an attractive candidate for additional observations, including studies of its atmospheric properties. We present and analyze follow-up photometric observations of the HD 97658 system acquired with the Microvariability and Oscillations of STars space telescope. Our results show no transit with the depth and ephemeris reported in the announcement paper. For the same ephemeris, we rule out transits for a planet with radius larger than 2.09 R_⊕, corresponding to the reported 3σ lower limit. We also report new radial velocity measurements which continue to support the existence of an exoplanet with a period of 9.5 days, and obtain improved orbital parameters.

Item Type:Article
Related URLs:
URLURL TypeDescription
Dragomir, Diana0000-0003-2313-467X
Matthews, Jaymie M.0000-0002-4461-080X
Howard, Andrew W.0000-0001-8638-0320
Antoci, Victoria0000-0002-0865-3650
Henry, Gregory W.0000-0003-4155-8513
Johnson, John A.0000-0001-9808-7172
Marcy, Geoffrey W.0000-0002-2909-0113
Rowe, Jason F.0000-0002-5904-1865
Additional Information:© 2012 American Astronomical Society. Received 2012 April 13; accepted 2012 October 11; published 2012 October 25. Based on data from the MOST satellite, a Canadian Space Agency mission operated by Microsatellite Systems Canada Inc. (MSCI; former Dynacon Inc.) and the Universities of Toronto and British Columbia, with the assistance of the University of Vienna. We thank Heather Knutson, Peter McCullough, and David Anderson for helpful conversations, as well as the many observers who contributed to the measurements reported here. We are thankful to the referee, Dan Fabrycky, for his comments and suggestions which have significantly improved this manuscript. We gratefully acknowledge the efforts and dedication of the Keck Observatory staff, especially Scott Dahm, Hien Tran, and Grant Hill for support of HIRES and Greg Wirth for support of remote observing. We extend special thanks to those of Hawaiian 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. D.D. is supported by a University of British Columbia Four Year Fellowship. Funding for the Stellar Astrophysics Centre (SAC) is provided by The Danish National Research Foundation and research is supported by the ASTERISK project (ASTERoseismic Investigations with SONG and Kepler) funded by the European Research Council (grant agreement No. 267864). The Natural Sciences and Engineering Research Council of Canada supports the research of D.B.G., J.M.M., A.F.J.M., and S.M.R. Additional support for A.F.J.M. comes from FQRNT (Québec). R.K. and W.W.W. were supported by the Austrian Science Fund (P22691-N16) and by the Austrian Research Promotion Agency-ALR.
Funding AgencyGrant Number
University of British ColumbiaUNSPECIFIED
Danish National Research FoundationUNSPECIFIED
European Research Council (ERC)267864 ASTERISK
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Fonds Québécois de la Recherche sur la Nature et les Technologies (FQRNT)UNSPECIFIED
FWF Der WissenschaftsfondsP22691-N16
Austrian Research Promotion Agency-ALRUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20121211-082050010
Persistent URL:
Official Citation:Non-detection of Previously Reported Transits of HD 97658b with MOST Photometry Diana Dragomir, Jaymie M. Matthews, Andrew W. Howard, Victoria Antoci, Gregory W. Henry, David B. Guenther, John A. Johnson, Rainer Kuschnig, Geoffrey W. Marcy, Anthony F. J. Moffat, Jason F. Rowe, Slavek M. Rucinski, Dimitar Sasselov, and Werner W. Weiss doi:10.1088/2041-8205/759/2/L41
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35899
Deposited By: Ruth Sustaita
Deposited On:11 Dec 2012 17:16
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page