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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 693644.0, MPI für Astronomie / Publikationen_mpia
A spectral differential characterization of low-mass companions
Authors:Kostogryz, N.; Kürster, M.; Yakobchuk, T.; Lyubchik, Y.; Kuznetsov, M.
Language:English
Publisher:EDP Sciences
Date of Publication (YYYY-MM-DD):2013-01
Title of Proceedings:Hot Planets and Cool Stars
Start Page:13003
Title of Series:EPJ Web of Conferences
Volume (in Series):47
Name of Conference/Meeting:Hot Planets and Cool Stars
Review Status:Internal review
Audience:Experts Only
Abstract / Description:We present a new approach with which the dynamical mass of low-mass companions around cool stars can be found. In order to discover companions to late-type stars the stellar spectrum is removed. For this we substract two spectra obtained at different orbital phases from each other in order to discover the companion spectrum in the difference spectrum in which the companion lines appear twice (positive and negative signal). The resulting radial velocity difference of these two signals provides the true mass of the companion. For our test case GJ1046, an M2V dwarf with a low-mass companion that most likely is a brown dwarf we select the CO line region in the K-band. We show that the dynamical mass of a faint companion to an M dwarf can be determined using our spectral differential technique. Only if the companion rotates rapidly and has a small radial velocity amplitude due to a high mass, does blending occur for all lines so that our approach fails. In addition to determining the companion mass, we restore the single companion spectrum from the difference spectrum using singular value decomposition.
Comment of the Author/Creator:Date: 2013 online, April 1, 2013
External Publication Status:published
Document Type:Conference-Paper
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2013EPJWC..4713003K [ID No:1]
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