Bibcode
Deshpande, R.; Blake, C. H.; Bender, C. F.; Mahadevan, S.; Terrien, R. C.; Carlberg, J. K.; Zasowski, G.; Crepp, J.; Rajpurohit, A. S.; Reylé, C.; Nidever, D. L.; Schneider, D. P.; Allende-Prieto, C.; Bizyaev, D.; Ebelke, G.; Fleming, S. W.; Frinchaboy, P. M.; Ge, J.; Hearty, F.; González-Hernández, J. I.; Malanushenko, E.; Malanushenko, V.; Majewski, S. R.; Marchwinski, R.; Muna, D.; Oravetz, D.; Pan, K.; Schiavon, R. P.; Shetrone, M.; Simmons, A.; Stassun, K. G.; Wilson, J. C.; Wisniewski, J. P.
Bibliographical reference
The Astronomical Journal, Volume 146, Issue 6, article id. 156, 15 pp. (2013).
Advertised on:
12
2013
Citations
42
Refereed citations
39
Description
We are carrying out a large ancillary program with the Sloan Digital Sky
Survey, SDSS-III, using the fiber-fed multi-object near-infrared APOGEE
spectrograph, to obtain high-resolution H-band spectra of more than 1200
M dwarfs. These observations will be used to measure spectroscopic
rotational velocities, radial velocities, physical stellar parameters,
and variability of the target stars. Here, we describe the target
selection for this survey, as well as results from the first year of
scientific observations based on spectra that will be publicly available
in the SDSS-III DR10 data release. As part of this paper we present
radial velocities and rotational velocities of over 200 M dwarfs, with a
vsin i precision of ~2 km s–1 and a measurement floor
at vsin i = 4 km s–1. This survey significantly
increases the number of M dwarfs studied for rotational velocities and
radial velocity variability (at ~100-200 m s–1), and
will inform and advance the target selection for planned radial velocity
and photometric searches for low-mass exoplanets around M dwarfs, such
as the Habitable Zone Planet Finder, CARMENES, and TESS. Multiple epochs
of radial velocity observations enable us to identify short period
binaries, and adaptive optics imaging of a subset of stars enables the
detection of possible stellar companions at larger separations. The
high-resolution APOGEE spectra, covering the entire H band, provide the
opportunity to measure physical stellar parameters such as effective
temperatures and metallicities for many of these stars. At the
culmination of this survey, we will have obtained multi-epoch spectra
and radial velocities for over 1400 stars spanning the spectral range
M0-L0, providing the largest set of near-infrared M dwarf spectra at
high resolution, and more than doubling the number of known
spectroscopic vsin i values for M dwarfs. Furthermore, by modeling
telluric lines to correct for small instrumental radial velocity shifts,
we hope to achieve a relative velocity precision floor of 50 m
s–1 for bright M dwarfs. With three or more epochs,
this precision is adequate to detect substellar companions, including
giant planets with short orbital periods, and flag them for
higher-cadence followup. We present preliminary, and promising, results
of this telluric modeling technique in this paper.
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Several spectroscopic analyses of stars with planets have recently been carried out. One of the most remarkable results is that planet-harbouring stars are on average more metal-rich than solar-type disc stars. Two main explanations have been suggested to link this metallicity excess with the presence of planets. The first of these, the “self
Garik
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Chemical Abundances in Stars
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Carlos
Allende Prieto