Stellar variability of the exoplanet hosting star HD 63454

Kane, Stephen R. and Dragomir, Diana and Ciardi, David R. and Lee, Jae Woo and Lo Curto, Gaspare and Lovis, Christophe and Naef, Dominique and Mahadevan, Suvrath and Pilyavsky, Genady and Udry, Stephane and Wang, Xuesong and Wright, Jason (2011) Stellar variability of the exoplanet hosting star HD 63454. The Astrophysical Journal, 737 (2). pp. 58-62. ISSN 0004-637X

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Of the hundreds of exoplanets discovered using the radial velocity (RV) technique, many are orbiting close to their host stars with periods less than 10 days. One of these, HD 63454, is a young active K dwarf which hosts a Jovian planet in a 2.82 day period orbit. The planet has a 14% transit probability and a predicted transit depth of 1.2%. Here we provide a re-analysis of the RV data to produce an accurate transit ephemeris. We further analyze 8 nights of time series data to search for stellar activity both intrinsic to the star and induced by possible interactions of the exoplanet with the stellar magnetospheres. We establish the photometric stability of the star at the 3 mmag level despite strong CaII emission in the spectrum. Finally, we rule out photometric signatures of both star-planet magnetosphere interactions and planetary transit signatures. From this we are able to place constraints on both the orbital and physical properties of the planet.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 08 Jun 2017 23:49
Last Modified: 27 Jun 2017 01:20
Uncontrolled Keywords: planetary systems; stars; HD 63454; radial velocities; photometric techniques
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
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