Accession Number:

ADA522683

Title:

Ruling Out Possible Secondary Stars to Exoplanet Host Stars Using the CHARA Array

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC REMOTE SENSING DIV

Report Date:

2010-05-17

Pagination or Media Count:

28.0

Abstract:

Of the over 450 exoplanets known to date, more than 420 of them have been discovered using radial velocity studies, a method that tells nothing about the inclination of the planets orbit. Because it is more likely that the companion is a planetary-mass object in a moderate- to high-inclination orbit than a low-mass stellar object in a nearly face-on orbit, the secondary bodies are presumed to be planets. Interferometric observations allow us to inspect the angular diameter fit residuals to calibrated visibilities in order to rule out the possibility of a lowmass stellar companion in a very low-inclination orbit. We used the Center for High Angular Resolution Astronomy CHARA Array interferometer to observe 20 exoplanet host stars and considered five potential secondary spectral types G5 V, K0 V, K5 V, M0 V, and M5 V. If a secondary star is present and is sufficiently bright, the effects of the added light will appear in interferometric observations where the planet will not. All secondary types could be eliminated from consideration for 7 host stars and no secondary stars of any spectral type could be ruled out for 7 more. The remaining 6 host stars showed a range of possible secondary types.

Subject Categories:

  • Astronomy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE