New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby Eberly Telescope

Details New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby Eberly Telescope New Observational Constraints on the υ Andromedae System with Data from the Hubble Space Telescope and Hobby Eberly Telescope

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21642510m&link_type=abstract

American Astronomical Society, AAS Meeting #216, #425.10

Astronomy and Astrophysics

Astronomy

Scientific paper

We have used high-cadence radial velocity measurements from the Hobby-Eberly Telescope with existing velocities from the Lick, Elodie, Harlan J. Smith and Whipple 60” telescopes combined with astrometric data from the Hubble Space Telescope Fine Guidance Sensors to refine the orbital parameters and determine the orbital inclinations and position angles of the ascending node of components υ And A c and d. With these inclinations and using M = 1.31M&sun; as a primary mass we determine the actual masses of two of the companions: υ And A c is13.98+2.3 Mjup, and υ And A d is 10.25+0.7 Mjup. These measurements represent the first astrometric determination of mutual inclination between objects in an extrasolar planetary system. The combined radial velocity measurements also reveal a long period trend indicating a fourth planet in the system. We investigate the dynamic stability of this system and analyze regions of stability, which suggest a probable mass of υ And A b. Finally, our parallaxes confirm that υ And B is a stellar companion of υ And A. Support for this work was provided by NASA through grants GO-09971, GO-10103, and GO-11210 from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy (AURA), Inc., under NASA contract NAS5-26555.

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