The Near-Ultraviolet Luminosity Function Of Young, Early M-Type Dwarf Stars

dc.contributor.utaustinauthorMann, Andrew W.en_US
dc.creatorAnsdell, Meganen_US
dc.creatorGaidos, Ericen_US
dc.creatorMann, Andrew W.en_US
dc.creatorLepine, Sebastienen_US
dc.creatorJames, Daviden_US
dc.creatorBuccino, Andreaen_US
dc.creatorBaranec, Christophen_US
dc.creatorLaw, Nicolas M.en_US
dc.creatorRiddle, Reeden_US
dc.creatorMauas, Pabloen_US
dc.creatorPetrucci, Rominaen_US
dc.date.accessioned2016-04-28T19:34:51Z
dc.date.available2016-04-28T19:34:51Z
dc.date.issued2015-01en
dc.description.abstractPlanets orbiting within the close-in habitable zones of M dwarf stars will be exposed to elevated high-energy radiation driven by strong magnetohydrodynamic dynamos during stellar youth. Near-ultraviolet (NUV) irradiation can erode and alter the chemistry of planetary atmospheres, and a quantitative description of the evolution of NUV emission from M dwarfs is needed when modeling these effects. We investigated the NUV luminosity evolution of early M-type dwarfs by cross-correlating the Lepine & Gaidos catalog of bright M dwarfs with the Galaxy Evolution Explorer (GALEX) catalog of NUV (1771-2831 angstrom) sources. Of the 4805 sources with GALEX counterparts, 797 have NUV emission significantly (>2.5 sigma) in excess of an empirical basal level. We inspected these candidate active stars using visible-wavelength spectra, high-resolution adaptive optics imaging, time-series photometry, and literature searches to identify cases where the elevated NUV emission is due to unresolved background sources or stellar companions; we estimated the overall occurrence of these "false positives" (FPs) as similar to 16%. We constructed an NUV luminosity function that accounted for FPs, detection biases of the source catalogs, and GALEX upper limits. We found the NUV luminosity function to be inconsistent with predictions from a constant star-formation rate and simplified age-activity relation defined by a two-parameter power law.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA NNX10AQ36G, NNX11AC33Gen_US
dc.description.sponsorshipRobert Martin Ayers Sciences Funden_US
dc.description.sponsorshipCalifornia Institute of Technologyen_US
dc.description.sponsorshipInter-University Centre for Astronomy and Astrophysicsen_US
dc.description.sponsorshipNational Science Foundation AST-0906060, AST-0960343, AST-1207891en_US
dc.description.sponsorshipMt. Cuba Astronomical Foundationen_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.identifierdoi:10.15781/T2S519
dc.identifier.Filename2015_01_nearultraviolet.pdfen_US
dc.identifier.citationAnsdell, Megan, Eric Gaidos, Andrew W. Mann, Sebastien L�pine, David James, Andrea Buccino, Christoph Baranec et al. "The Near-ultraviolet Luminosity Function of Young, Early M-type Dwarf Stars." The Astrophysical Journal, Vol. 798, No. 1 (Jan., 2015): 41.en_US
dc.identifier.doi10.1088/0004-637x/798/1/41en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34805
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectbinaries: closeen_US
dc.subjectstars: activityen_US
dc.subjectstars: late-typeen_US
dc.subjectstars: luminosityen_US
dc.subjectfunction, mass functionen_US
dc.subjectdigital sky surveyen_US
dc.subjectlow-mass starsen_US
dc.subjectlaser adaptive opticsen_US
dc.subjectsolaren_US
dc.subjectneighborhooden_US
dc.subjecthabitable zonesen_US
dc.subjectx-rayen_US
dc.subjectmetallicity relationen_US
dc.subjectformationen_US
dc.subjecthistoryen_US
dc.subjectthermal escapeen_US
dc.subjectwhite-dwarfsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Near-Ultraviolet Luminosity Function Of Young, Early M-Type Dwarf Starsen_US
dc.typeArticleen_US

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