The near-ultraviolet luminosity function of young, early M-type dwarf stars

Planets 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...

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Autores principales:	Buccino, Andrea Paola, Mauas, Pablo J.D., Petrucci, Romina Paola
Publicado:	2015
Materias:	Binaries: Close Stars: Activity Stars: Late-type Stars: Luminosity function, mass function
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v798_n1_p_Ansdell http://hdl.handle.net/20.500.12110/paper_0004637X_v798_n1_p_Ansdell
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_0004637X_v798_n1_p_Ansdell
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spelling	paper:paper_0004637X_v798_n1_p_Ansdell2023-06-08T14:29:13Z The near-ultraviolet luminosity function of young, early M-type dwarf stars Buccino, Andrea Paola Mauas, Pablo J.D. Petrucci, Romina Paola Binaries: Close Stars: Activity Stars: Late-type Stars: Luminosity function, mass function Planets 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 Lépine & Gaidos catalog of bright M dwarfs with the Galaxy Evolution Explorer (GALEX) catalog of NUV (1771-2831 A˚) sources. Of the 4805 sources with GALEX counterparts, 797 have NUV emission significantly (>2.5σ) 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 ∼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. © 2015. The American Astronomical Society. All rights reserved. Fil:Buccino, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mauas, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Petrucci, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v798_n1_p_Ansdell http://hdl.handle.net/20.500.12110/paper_0004637X_v798_n1_p_Ansdell
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Binaries: Close Stars: Activity Stars: Late-type Stars: Luminosity function, mass function
spellingShingle	Binaries: Close Stars: Activity Stars: Late-type Stars: Luminosity function, mass function Buccino, Andrea Paola Mauas, Pablo J.D. Petrucci, Romina Paola The near-ultraviolet luminosity function of young, early M-type dwarf stars
topic_facet	Binaries: Close Stars: Activity Stars: Late-type Stars: Luminosity function, mass function
description	Planets 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 Lépine & Gaidos catalog of bright M dwarfs with the Galaxy Evolution Explorer (GALEX) catalog of NUV (1771-2831 A˚) sources. Of the 4805 sources with GALEX counterparts, 797 have NUV emission significantly (>2.5σ) 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 ∼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. © 2015. The American Astronomical Society. All rights reserved.
author	Buccino, Andrea Paola Mauas, Pablo J.D. Petrucci, Romina Paola
author_facet	Buccino, Andrea Paola Mauas, Pablo J.D. Petrucci, Romina Paola
author_sort	Buccino, Andrea Paola
title	The near-ultraviolet luminosity function of young, early M-type dwarf stars
title_short	The near-ultraviolet luminosity function of young, early M-type dwarf stars
title_full	The near-ultraviolet luminosity function of young, early M-type dwarf stars
title_fullStr	The near-ultraviolet luminosity function of young, early M-type dwarf stars
title_full_unstemmed	The near-ultraviolet luminosity function of young, early M-type dwarf stars
title_sort	near-ultraviolet luminosity function of young, early m-type dwarf stars
publishDate	2015
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v798_n1_p_Ansdell http://hdl.handle.net/20.500.12110/paper_0004637X_v798_n1_p_Ansdell
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_version_	1768542624580370432

The near-ultraviolet luminosity function of young, early M-type dwarf stars

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