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Empirical Limits on Radial Velocity - Planet Detection for Young Stars

Hillenbrand, Lynne and Isaacson, Howard and Marcy, Geoffrey and Barenfeld, Scott and Fischer, Debra and Howard, Andrew (2014) Empirical Limits on Radial Velocity - Planet Detection for Young Stars. In: 18th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun Proceedings of Lowell Observatory. , pp. 759-765. http://resolver.caltech.edu/CaltechAUTHORS:20170629-130948937

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Abstract

We report initial results from our long term search using precision radial velocities for planetary-mass companions located within a few AU of stars younger than the Sun. Based on a sample of >150 stars, we define a floor in the radial velocity scatter, σ_(RV), as a function of the chromospheric activity level R'_(HK). This lower bound to the jitter, which increases with increasing stellar activity, sets the minimum planet mass that could be detected. Adopting a median activity-age relationship reveals the astrophysical limits to planet masses discernable via radial velocity monitoring, as a function of stellar age. Considering solar-mass primaries having the mean jitter-activity level, when they are younger than 100 / 300 / 1000 Myr, the stochastic jitter component in radial velocity measurements restricts detectable companion masses to > 0.3 / 0.2 / 0.1 M_(Jupiter). These numbers require a large number — several tens — of radial velocity observations taken over a time frame longer than the orbital period. Lower companion mass limits can be achieved for stars with less than the mean jitter and/or with an increased number of observations.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://arxiv.org/abs/1408.3475arXivDiscussion Paper
http://www2.lowell.edu/workshops/coolstars18/index.htmlOrganizationConference
ORCID:
AuthorORCID
Isaacson, Howard0000-0002-0531-1073
Marcy, Geoffrey0000-0002-2909-0113
Howard, Andrew0000-0001-8638-0320
Alternate Title:Empirical Limits on Radial Velocity Planet Detection for Young Stars
Additional Information:Submitted on 15 Aug 2014.
Record Number:CaltechAUTHORS:20170629-130948937
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170629-130948937
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78701
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Jun 2017 18:45
Last Modified:21 Aug 2017 20:32

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