NOAO >   Observing Info >   Approved Programs >   2014A-0465

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Proposal Information for 2014A-0465


PI: Robert De Rosa, Arizona State University, rjderosa@asu.edu
Address: Department of Physics and Astronomy, Box 871504, Tempe, AZ, 85287-1504, USA

CoI: Jenny Patience, Arizona State University
CoI: Arthur Vigan, Laboratoire d'Astrophysique de Marseille
CoI: Patrick Young, Arizona State University
CoI: Abhi Rajan, Arizona State University
CoI: Kim Ward-Duong, Arizona State University
CoI: Joanna Bulger, University of Exeter
CoI: Amanda Truitt, Arizona State University

Title: Spectroscopic characterization of a newly-identified substellar companion to an early-type star

Abstract: With the cross-dispersed spectroscopy mode of the GNIRS instrument, we propose to obtain YJHK spectra of a newly identified co-moving companion to a nearby A-type star. The co-moving object resolved in previous Gemini/NIRI observations has a K-band magnitude consistent with a 40-50 Mj companion, if physically associated. Based on the position of the early A-type primary on the colour-magnitude diagram, the age of the system is intermediate to known brown dwarfs within young moving groups (<100 Myrs), and within the field (>1 Gyrs) – occupying an age range for which very few brown dwarfs are currently known. We also propose to obtain higher-resolution NIFS K-band spectra in order to measure the C/O ratio of the companion, thought to be diagnostic of the mechanism through which the object formed, providing important context to the recent C/O measurement of the HR 8799 c exoplanet. The proposed observations will confirm the substellar nature of this object, as well as provide a useful empirical benchmark for the development of theoretical evolutionary models of these cool, low-mass objects.


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NOAO >   Observing Info >   Approved Programs >   2014A-0465

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