A Caltech Library Service

Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts

Muirhead, Philip S. and Becker, Juliette C. and Feiden, Gregory A. and Rojas-Ayala, Bárbara and Vanderburg, Andrew and Price, Ellen M. and Thorp, Rachel and Law, Nicholas M. and Riddle, Reed and Baranec, Christoph and Hamren, Katherine and Schlawin, Everett and Covey, Kevin R. and Johnson, John Asher and Lloyd, James P. (2014) Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts. Astrophysical Journal Supplement Series, 213 (1). Art. No. 5. ISSN 0067-0049. doi:10.1088/0067-0049/213/1/5.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


We present H- and K-band spectra for late-type Kepler Objects of Interest (the "Cool KOIs"): low-mass stars with transiting-planet candidates discovered by NASA's Kepler Mission that are listed on the NASA Exoplanet Archive. We acquired spectra of 103 Cool KOIs and used the indices and calibrations of Rojas-Ayala et al. to determine their spectral types, stellar effective temperatures, and metallicities, significantly augmenting previously published values. We interpolate our measured effective temperatures and metallicities onto evolutionary isochrones to determine stellar masses, radii, luminosities, and distances, assuming the stars have settled onto the main sequence. As a choice of isochrones, we use a new suite of Dartmouth predictions that reliably include mid-to-late M dwarf stars. We identify five M4V stars: KOI-961 (confirmed as Kepler 42), KOI-2704, KOI-2842, KOI-4290, and the secondary component to visual binary KOI-1725, which we call KOI-1725 B. We also identify a peculiar star, KOI-3497, which has Na and Ca lines consistent with a dwarf star but CO lines consistent with a giant. Visible-wavelength adaptive optics imaging reveals two objects within a 1 arcsec diameter; however, the objects' colors are peculiar. The spectra and properties presented in this paper serve as a resource for prioritizing follow-up observations and planet validation efforts for the Cool KOIs and are all available for download online using the "data behind the figure" feature.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Muirhead, Philip S.0000-0002-0638-8822
Becker, Juliette C.0000-0002-7733-4522
Feiden, Gregory A.0000-0002-2012-7215
Vanderburg, Andrew0000-0001-7246-5438
Law, Nicholas M.0000-0001-9380-6457
Riddle, Reed0000-0002-0387-370X
Baranec, Christoph0000-0002-1917-9157
Covey, Kevin R.0000-0001-6914-7797
Johnson, John Asher0000-0001-9808-7172
Additional Information:© 2014 The American Astronomical Society. Received 2014 February 9; accepted 2014 May 5; published 2014 June 18. We thank Andrew Mann and Ryan Terrien for helping us implement their respective methods for measuring metallicities with infrared spectra. We thank the staff at Palomar Observatory for providing support during our many observation runs, including Bruce Baker, Mike Doyle, Jamey Eriksen, Carolyn Heffner, John Henning, Steven Kunsman, Dan McKenna, Jean Mueller, Kajsa Peffer, Kevin Rykoski, and Greg van Idsinga. The Robo-AO system is supported by collaborating partner institutions, the California Institute of Technology and the Inter-University Centre for Astronomy and Astrophysics, and by the National Science Foundation under grant nos. AST-0906060 and AST-0960343, by the Mount Cuba Astronomical Foundation, by a gift from Samuel Oschin. C.B. acknowledges support from the Alfred P. Sloan Foundation. J.B. thanks Mr. and Mrs. Kenneth Adelman for providing funding for her 2012 Alain Porter Memorial Summer Undergraduate Research Fellowship. A.V. is supported by the National Science Foundation Graduate Research Fellowship under grant no. DGE1144152. J.A.J. is supported by generous grants from the David and Lucile Packard Foundation and the Alfred P. Sloan Foundation. This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Some of the Palomar 200 inch Telescope time was provided by Cornell University. P.S.M. acknowledges support for this work from the Hubble Fellowship Program, provided by NASA through Hubble Fellowship grant HST-HF-51326.01-A awarded by the STScI, which is operated by the AURA, Inc., for NASA, under contract NAS 5-26555. Facilities: Kepler - The Kepler Mission, Hale (TripleSpec) - Palomar Observatory's 5.1m Hale Telescope, PO:1.5m (Robo-AO) - Palomar Observatory's 1.5 meter Telescope
Funding AgencyGrant Number
Caltech Summer Undergraduate Research Fellowship (SURF)UNSPECIFIED
Inter-University Centre for Astronomy and AstrophysicsUNSPECIFIED
Mt. Cuba Astronomical FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
2012 Alain Porter Memorial Summer Undergraduate Research FellowshipUNSPECIFIED
NSF Graduate Research FellowshipDGE1144152
David and Lucile Packard FoundationUNSPECIFIED
NASA Hubble FellowshipHST-HF-51326.01-A
Subject Keywords:binaries: eclipsing; binaries: visual; planetary systems; stars: abundances; stars: fundamental parameters; stars: individual (KOI-2704, KOI-2842, KOI-4290, KOI-1725, KOI-3497); stars: late-type; stars: low-mass
Issue or Number:1
Record Number:CaltechAUTHORS:20140815-092515653
Persistent URL:
Official Citation:Characterizing the Cool KOIs. VI. H- and K-band Spectra of Kepler M Dwarf Planet-candidate Hosts Philip S. Muirhead et al. 2014 ApJS 213 5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48596
Deposited By: Jason Perez
Deposited On:22 Aug 2014 06:17
Last Modified:10 Nov 2021 18:33

Repository Staff Only: item control page