NOAO >   Observing Info >   Approved Programs >   2016A-0055

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Program Information for 2016A-0055


PI: Lea Hirsch, UC Berkeley, lhirsch@berkeley.edu
Address: Astrophysics, 501 Campbell Hall, Berkeley, CA 94720 USA

CoI: Geoff Marcy, UC Berkeley
CoI: David Ciardi, NEXScI
CoI: Elise Furlan, NEXScI

Title: Planets in Binary Systems

Abstract: Nearly half of all solar-type stars host at least one stellar companion, and while planets appear to be common around solar-type stars, the impact of stellar multiplicity on planet formation and evolution is not well understood. To study these impacts, we are carrying out a combined high-resolution imaging and precision radial velocity survey of the 309 closest solar-type stars ($<$25 pc). We propose to continue to use the speckle imaging camera DSSI on the WIYN 3.5-meter telescope to search for stellar companions with separations as close as 1 AU from their host stars. Many of our sample stars have been part of the California Planet Search, yielding information on their planetary and close-in stellar companions, and 40 of these stars show long term RV trends from either stellar or planetary companions. The speckle data, combined with the long-term radial velocity data and supplemental AO imaging, will enable a more complete picture of the stellar companion rates, including the nature of the 40 trends stars, and will enable a comparison of the occurrence and properties of planets among the single and multiple star systems. By comparing planets in single star systems to those in binary systems of varying masses and orbital parameters, we will be able to set meaningful limits on the formation and evolutionary mechanisms dominant in single versus binary stellar systems.

Program Type: Standard/NASA WIYN

Scheduled Nights:
Run 1 (2016A):  WIYN/DSSI -- 30hrs


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2016A-0055

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