Skip to content

Research at St Andrews

The MUSCLES Treasury Survey. III. X-ray to infrared spectra of 11 M and K stars hosting planets

Research output: Contribution to journalArticle

Author(s)

R. O. P. Loyd, Kevin France, Allison Youngblood, Christian Schneider, Alexander Brown, Renyu Hu, Jeffrey Linsky, Cynthia S. Froning, Seth Redfield, Sarah Rugheimer, Feng Tian

Abstract

We present a catalog of panchromatic spectral energy distributions (SEDs) for 7 M and 4 K dwarf stars that span X-ray to infrared wavelengths (5 Å -5.5 μm). These SEDs are composites of Chandra or XMM-Newton data from 5-∼50 Å, a plasma emission model from ∼50-100 Å, broadband empirical estimates from 100-1170 Å, Hubble Space Telescope data from 1170-5700 Å, including a reconstruction of stellar Lyα emission at 1215.67 Å, and a PHOENIX model spectrum from 5700-55000 Å. Using these SEDs, we computed the photodissociation rates of several molecules prevalent in planetary atmospheres when exposed to each star's unattenuated flux ("unshielded" photodissociation rates) and found that rates differ among stars by over an order of magnitude for most molecules. In general, the same spectral regions drive unshielded photodissociations both for the minimally and maximally FUV active stars. However, for O3 visible flux drives dissociation for the M stars whereas near-UV flux drives dissociation for the K stars. We also searched for an far-UV continuum in the assembled SEDs and detected it in 5/11 stars, where it contributes around 10% of the flux in the range spanned by the continuum bands. An ultraviolet continuum shape is resolved for the star Eri that shows an edge likely attributable to Si ii recombination. The 11 SEDs presented in this paper, available online through the Mikulski Archive for Space Telescopes, will be valuable for vetting stellar upper-atmosphere emission models and simulating photochemistry in exoplanet atmospheres.

Close

Details

Original languageEnglish
Article number102
Number of pages19
JournalAstrophysical Journal
Volume824
Issue number2
DOIs
Publication statusPublished - 20 Jun 2016

    Research areas

  • Stars: low-mass, Ultraviolet: stars, X-rays: stars

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by journal

  1. A cancellation nanoflare model for solar chromospheric and coronal heating. II. 2D theory and simulations

    Syntelis, P., Priest, E. R. & Chitta, L. P., 7 Feb 2019, In : Astrophysical Journal. 872, 1, 15 p., 32.

    Research output: Contribution to journalArticle

  2. Heating effects from driven transverse and Alfvén waves in coronal loops

    Guo, M., Van Doorsselaere, T., Karampelas, K., Li, B., Antolin, P. & De Moortel, I., 10 Jan 2019, In : Astrophysical Journal. 870, 2, 10 p., 55.

    Research output: Contribution to journalArticle

  3. The Sloan Digital Sky Survey Reverberation Mapping Project: systematic investigations of short-timescale CIV broad absorption line variability

    Hemler, Z. S., Grier, C. J., Brandt, W. N., Hall, P. B., Horne, K., Shen, Y., Trump, J. R., Schneider, D. P., Vivek, M., Bizyaev, D., Oravetz, A., Oravetz, D. & Pan, K., 6 Feb 2019, In : Astrophysical Journal. 872, 1, 21.

    Research output: Contribution to journalArticle

  4. The rotation-disk connection in young brown dwarfs: strong evidence for early rotational braking

    Moore, K., Scholz, A. & Jayawardhana, R., 20 Feb 2019, In : Astrophysical Journal. 872, 2, 20 p., 159.

    Research output: Contribution to journalArticle

  5. A comparison of simulated JWST observations derived from equilibrium and non-equilibrium chemistry models of giant exoplanets

    Blumenthal, S. D., Mandell, A. M., Hébrard, E., Batalha, N. E., Cubillos, P. E., Rugheimer, S. & Wakeford, H. R., 30 Jan 2018, In : Astrophysical Journal. 853, 2, 138.

    Research output: Contribution to journalArticle

Related by journal

  1. Astrophysical Journal (Journal)

    Carolin Villforth (Reviewer)
    2011 → …

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  2. Astrophysical Journal (Journal)

    Christiane Helling (Reviewer)
    1 Jan 200631 Dec 2017

    Activity: Publication peer-review and editorial work typesPeer review of manuscripts

  3. Astrophysical Journal (Journal)

    Duncan Hendry Mackay (Editor)
    1997 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

  4. Astrophysical Journal (Journal)

    Alan William Hood (Editor)
    1980 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

ID: 244634858