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THE APOGEE SPECTROSCOPIC SURVEY OF KEPLER PLANET HOSTS: FEASIBILITY, EFFICIENCY, AND FIRST RESULTS

Fleming, SW and Mahadevan, S and Deshpande, R and Bender, CF and Terrien, RC and Marchwinski, RC and Wang, J and Roy, A and Stassun, KG and Allende Prieto, C and Cunha, K and Smith, VV and Agol, E and Ak, H and Bastien, FA and Bizyaev, D and Crepp, JR and Ford, EB and Frinchaboy, PM and Anibal Garcia-Hernandez, D and Perez, AEG and Gaudi, BS and Ge, J and Hearty, F and Ma, B and Majewski, SR and Meszaros, S and Nidever, DL and Pan, K and Pepper, J and Pinsonneault, MH and Schiavon, RP and Schneider, DP and Wilson, JC and Zamora, O and Zasowski, G (2015) THE APOGEE SPECTROSCOPIC SURVEY OF KEPLER PLANET HOSTS: FEASIBILITY, EFFICIENCY, AND FIRST RESULTS. ASTRONOMICAL JOURNAL, 149 (4). ISSN 0004-6256

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Abstract

The Kepler mission has yielded a large number of planet candidates from among the Kepler Objects of Interest(KOIs), but spectroscopic follow-up of these relatively faint stars is a serious bottleneck in confirming and characterizing these systems. We present motivation and survey design for an ongoing project with the Sloan Digital Sky Survey III multiplexed Apache Point Observatory Galactic Evolution Experiment (APOGEE) near-infrared spectrograph to monitor hundreds of KOI host stars. We report some of our first results using representative targets from our sample, which include current planet candidates that we find to be false positives, as well as candidates listed as false positives that we do not find to be spectroscopic binaries. With this survey, KOI hosts are observed over ∼20 epochs at a radial velocity (RV) precision of 100–200ms−1. These observations can easily identify a majority of false positives caused by physically associated stellar or substellar binaries, and in many cases, fully characterize their orbits. We demonstrate that APOGEE is capable of achieving RV precision at the 100–200ms−1 level over long time baselines, and that APOGEE’s multiplexing capability makes it substantially more efficient at identifying false positives due to binaries than other single-object spectrographs working to confirm KOIs as planets. These APOGEE RVs enable ancillary science projects, such as studies of fundamental stellar astrophysics or intrinsically rare substellar companions. The coadded APOGEE spectra can be used to derive stellar properties (Teff, log g) and chemical abundances of over a dozen elements to probe correlations of planet properties with individual elemental abundances.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 11 Jan 2016 11:51
Last Modified: 11 Jan 2016 12:04
DOI or Identification number: 10.1088/0004-6256/149/4/143
URI: http://researchonline.ljmu.ac.uk/id/eprint/2567

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