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France, K.; Loyd, R.O.P.; Youngblood, A.; Brown, A.; Schneider, P.C.; Hawley, S.L.; Froning, C.S.; Linsky, J.L.; Roberge, A.; Buccino, A.P.; Davenport, J.R.A.; Fontenla, J.M.; Kaltenegger, L.; Kowalski, A.F.; Mauas, P.J.D.; Miguel, Y.; Redfield, S.; Rugheimer, S. (...) Weisenburger, K.L. "THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW" (2016) Astrophysical Journal. 820(2)
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Abstract:

Ground- and space-based planet searches employing radial velocity techniques and transit photometry have detected thousands of planet-hosting stars in the Milky Way. With so many planets discovered, the next step toward identifying potentially habitable planets is atmospheric characterization. While the Sun-Earth system provides a good framework for understanding the atmospheric chemistry of Earth-like planets around solar-type stars, the observational and theoretical constraints on the atmospheres of rocky planets in the habitable zones (HZs) around low-mass stars (K and M dwarfs) are relatively few. The chemistry of these atmospheres is controlled by the shape and absolute flux of the stellar spectral energy distribution (SED), however, flux distributions of relatively inactive low-mass stars are poorly understood at present. To address this issue, we have executed a panchromatic (X-ray to mid-IR) study of the SEDs of 11 nearby planet-hosting stars, the Measurements of the Ultraviolet Spectral Characteristics of Low-mass Exoplanetary Systems (MUSCLES) Treasury Survey. The MUSCLES program consists visible observations from Hubble and ground-based observatories. Infrared and astrophysically inaccessible wavelengths (EUV and Lyα) are reconstructed using stellar model spectra to fill in gaps in the observational data. In this overview and the companion papers describing the MUSCLES survey, we show that energetic radiation (X-ray and ultraviolet) is present from magnetically active stellar atmospheres at all times for stars as late as M6. The emission line luminosities of C iv and Mg ii are strongly correlated with band-integrated luminosities and we present empirical relations that can be used to estimate broadband FUV and XUV (≡X-ray + EUV) fluxes from individual stellar emission line measurements. We find that while the slope of the SED, FUV/NUV, increases by approximately two orders of magnitude form early K to late M dwarfs (≈0.01-1), the absolute FUV and XUV flux levels at their corresponding HZ distances are constant to within factors of a few, spanning the range 10-70 erg cm -2 s -1 in the HZ. Despite the lack of strong stellar activity indicators in their optical spectra, several of the M dwarfs in our sample show spectacular UV flare emission in their light curves. We present an example with flare/quiescent ultraviolet flux ratios of the order of 100:1 where the transition region energy output during the flare is comparable to the total quiescent luminosity of the star E flare (UV) ∼ 0.3 L ∗ Δt (Δt = 1 s). Finally, we interpret enhanced L(line)/L Bol ratios for C iv and N v as tentative observational evidence for the interaction of planets with large planetary mass-to-orbital distance ratios (M plan /a plan ) with the transition regions of their host stars. © 2016. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW
Autor:France, K.; Loyd, R.O.P.; Youngblood, A.; Brown, A.; Schneider, P.C.; Hawley, S.L.; Froning, C.S.; Linsky, J.L.; Roberge, A.; Buccino, A.P.; Davenport, J.R.A.; Fontenla, J.M.; Kaltenegger, L.; Kowalski, A.F.; Mauas, P.J.D.; Miguel, Y.; Redfield, S.; Rugheimer, S.; Tian, F.; Vieytes, M.C.; Walkowicz, L.M.; Weisenburger, K.L.
Filiación:Laboratory for Atmospheric and Space Physics, University of Colorado, 600 UCB, Boulder, CO 80309, United States
Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309, United States
European Space Research and Technology Centre (ESA/ESTEC), Keplerlaan 1, Noordwijk, 2201 AZ, Netherlands
Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195, United States
Department of Astronomy, University of Texas at Austin, Austin, TX 78712, United States
JILA, University of Colorado and NIST, 440 UCB, Boulder, CO 80309, United States
Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, United States
Instituto de Astronomía y Física Del Espacio (UBA-CONICET), Departamento de Física (UBA), CC.67, suc. 28, Buenos Aires, 1428, Argentina
Department of Physics and Astronomy, Western Washington University, Bellingham, WA 98225, United States
NorthWest Research Assoc., 3380 Mitchell Lane, Boulder, CO 80301-2245, United States
Carl Sagan Institute, Cornell University, Ithaca, NY 14850, United States
Department of Astronomy, University of Maryland, College Park, MD 20742, United States
Laboratoire Lagrange, Universite de Nice-Sophia Antipolis, Observatoire de la Cote d'Azur, CNRS, Blvd de l'Observatoire, CS 34229, Nice Cedex 4, F-06304, France
Astronomy Department and Van Vleck Observatory, Wesleyan University, Middletown, CT 06459-0123, United States
Department of Earth and Environmental Sciences, Irvine Building, University of St. Andrews, St. Andrews, KY16 9AL, United Kingdom
Ministry of Education, Key Laboratory for Earth System Modeling, Center for Earth System Science, Tsinghua University, Beijing, 100084, China
Instituto de Astronomía y Física Del Espacio (UBA-CONICET), UNTREF, CC.67, suc. 28, Buenos Aires, 1428, Argentina
Adler Planetarium, 1300 S Lakeshore Drive, Chicago, IL 60605, United States
Palabras clave:planetary systems; stars: activity; stars: low-mass
Año:2016
Volumen:820
Número:2
DOI: http://dx.doi.org/10.3847/0004-637X/820/2/89
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v820_n2_p_France

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Citas:

---------- APA ----------
France, K., Loyd, R.O.P., Youngblood, A., Brown, A., Schneider, P.C., Hawley, S.L., Froning, C.S.,..., Weisenburger, K.L. (2016) . THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW. Astrophysical Journal, 820(2).
http://dx.doi.org/10.3847/0004-637X/820/2/89
---------- CHICAGO ----------
France, K., Loyd, R.O.P., Youngblood, A., Brown, A., Schneider, P.C., Hawley, S.L., et al. "THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW" . Astrophysical Journal 820, no. 2 (2016).
http://dx.doi.org/10.3847/0004-637X/820/2/89
---------- MLA ----------
France, K., Loyd, R.O.P., Youngblood, A., Brown, A., Schneider, P.C., Hawley, S.L., et al. "THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW" . Astrophysical Journal, vol. 820, no. 2, 2016.
http://dx.doi.org/10.3847/0004-637X/820/2/89
---------- VANCOUVER ----------
France, K., Loyd, R.O.P., Youngblood, A., Brown, A., Schneider, P.C., Hawley, S.L., et al. THE MUSCLES TREASURY SURVEY. I. MOTIVATION and OVERVIEW. Astrophys. J. 2016;820(2).
http://dx.doi.org/10.3847/0004-637X/820/2/89