Lyman-$\alpha$ Observations of High Radial Velocity Low-Mass Stars Ross 1044 and Ross 825

Abstract

The discovery of habitable zone (HZ) planets around low-mass stars has highlighted the need for a comprehensive understanding of the radiation environments in which such planets reside. Of particular importance is knowledge of the far-ultraviolet (FUV) radiation, as low-mass stars are typically much more active than solar-type stars and the proximity of their HZs can be one tenth the distance. The vast majority of the flux emitted by low-mass stars at FUV wavelengths occurs in the Lyman-$\alpha$ line at 1216 Angstroms. However, measuring a low-mass star's Lyman-$\alpha$ emission directly is almost always impossible because of the contaminating effects of interstellar hydrogen and geocoronal airglow. We observed Ross 825 (K3) and Ross 1044 (M0), two stars with exceptional radial velocities, with the STIS spectrograph aboard the Hubble Space Telescope (HST). Their radial velocities resulted in significant line shifts, allowing for a more complete view of their Lyman-$\alpha$ line profiles. We provide an updated relation between effective temperature and Lyman-$\alpha$ flux using Gaia DR2 astrometry as well as updated, model-independent relationships between Lyman-$\alpha$ flux and UV flux measurements from the Galaxy Evolution Explorer (GALEX) for low-mass stars. These new relations, in combination with GALEX's considerable spatial coverage, provide substantial predictive power for the Lyman-$\alpha$ environments for thousands of nearby, low-mass stars.

arXiv commentAccepted for publication in the Astrophysical Journal

References in corpus (99)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• Validation of the new Hipparcos reduction
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Gaia Data Release 2: The astrometric solution
• Habitable Zones Around Main-Sequence Stars: New Estimates
• The PLATO 2.0 Mission
• Solar Models with Helium and Heavy Element Diffusion
• New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• The TESS Input Catalog and Candidate Target List
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• HST Time-Series Photometry of the Transiting Planet of HD 209458
• Extreme Water Loss and Abiotic O${}_2$ Buildup On Planets Throughout the Habitable Zones of M Dwarfs
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I
• The Effect of a Strong Stellar Flare on the Atmospheric Chemistry of an Earth-like Planet Orbiting an M dwarf
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology
• The MUSCLES Treasury Survey I: Motivation and Overview
• A dynamically-packed planetary system around GJ667C with three super-Earths in its habitable zone
• Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs
• The Luminosity and Mass Functions of Low-Mass Stars in the Galactic Disk: II. The Field
• The Structure of the Local Interstellar Medium V: Electron Densities
• Spectral Properties of Cool Stars: Extended Abundance Analysis of 1617 Planet Search Stars
• A stellar-mass-dependent drop in planet occurrence rates
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• What is the Total Deuterium Abundance in the Local Galactic Disk?
• The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• The HARPS search for Earth-like planets in the habitable zone: I -- Very low-mass planets around HD20794, HD85512 and HD192310
• Stellar Lyman-alpha Emission Lines in the Hubble Space Telescope Archive: Intrinsic Line Fluxes and Absorption from the Heliosphere and Astrospheres
• Catalogue of [Fe/H] determinations for FGK stars : 2001 edition
• Photochemistry in Terrestrial Exoplanet Atmospheres I: Photochemistry Model and Benchmark Cases
• The Ultraviolet Radiation Environment Around M dwarf Exoplanet Host Stars
• The MUSCLES Treasury Survey II: Intrinsic Lyman Alpha and Extreme Ultraviolet Spectra of K and M Dwarfs with Exoplanets
• Oxygen Abundances in Nearby FGK Stars and the Galactic Chemical Evolution of the Local Disk and Halo
• Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations
• A rocky planet transiting a nearby low-mass star
• The MUSCLES Treasury Survey III: X-ray to Infrared Spectra of 11 M and K Stars Hosting Planets
• Near-infrared Metallicities, Radial Velocities and Spectral Types for 447 Nearby M Dwarfs
• Lithium abundances in nearby FGK dwarf and subgiant stars: internal destruction, Galactic chemical evolution, and exoplanets
• DUst Around NEarby Stars. The survey observational results
• An ancient extrasolar system with five sub-Earth-size planets
• New Debris Disks Around Young, Low Mass Stars Discovered With The Spitzer Space Telescope
• Abiotic Ozone and Oxygen in Atmospheres Similar to Prebiotic Earth
• Identifying the Young Low-mass Stars within 25 pc. I. Spectroscopic Observations
• CARMENES input catalogue of M dwarfs. I. Low-resolution spectroscopy with CAFOS
• Abiotic O${}_2$ Levels on Planets around F, G, K, and M Stars: Possible False Positives for Life?
• HST/STIS Optical Transit Transmission Spectra of the hot-Jupiter HD209458b
• High Stellar FUV/NUV Ratio and Oxygen Contents in the Atmospheres of Potentially Habitable Planets
• Effect of UV Radiation on the Spectral Fingerprints of Earth-like Planets Orbiting M dwarfs
• Identifying the young low-mass stars within 25 pc. II. Distances, kinematics and group membership
• Kepler Planet Occurrence Rates for Mid-Type M Dwarfs as a Function of Spectral Type
• Chromospheric activity as age indicator
• The influence of atomic diffusion on stellar ages and chemical tagging
• Abundances in the Local Region II: F, G and K Dwarfs and Subgiants
• Age consistency between exoplanet hosts and field stars
• WIYN Open Cluster Study. LXXV. Testing the Metallicity Dependence of Stellar Lithium Depletion Using Hyades-Aged Clusters. 1. Hyades & Praesepe
• Superhabitable Worlds
• The MUSCLES Treasury Survey IV: Scaling Relations for Ultraviolet, Ca II K, and Energetic Particle Fluxes from M Dwarfs
• On the Age of the TRAPPIST-1 System
• Reconnaissance of the TRAPPIST-1 exoplanet system in the Lyman-$\alpha$ line
• Computing Intrinsic Lyman-alpha Fluxes of F5 V to M5 V Stars
• Time-resolved Ultraviolet Spectroscopy of the M-dwarf GJ 876 Exoplanetary System
• A Catalog of Cool Dwarf Targets for the Transiting Exoplanet Survey Satellite
• Predicting the Extreme Ultraviolet Radiation Environment of Exoplanets Around Low-Mass Stars: the TRAPPIST-1 System
• An empirical calibration to estimate cool dwarf fundamental parameters from H-band spectra
• Trigonometric Parallaxes for 1,507 Nearby Mid-to-Late M-dwarfs
• Semi-empirical Modeling of the Photosphere, Chromosphere, Transition Region, and Corona of the M-dwarf Host Star GJ 832
• The deuterium-to-oxygen ratio in the interstellar medium
• Orbital Architectures of Planet-Hosting Binaries: I. Forming Five Small Planets in the Truncated Disk of Kepler-444A
• Living with a Red Dwarf: Rotation and X-ray and Ultraviolet Properties of the Halo Population Kapteyn's Star
• The radii of the nearby K5V and K7V stars 61 Cyg A & B - CHARA/FLUOR interferometry and CESAM2k modeling
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert
• Radiative braking in the extended exosphere of GJ436b
• About Exobiology: The Case for Dwarf K Stars
• Classically and Asteroseismically constrained 1D Stellar Evolution Models of $\alpha$ Centauri A and B using Empirical Mixing Length Calibrations
• Fluctuations and Flares in the Ultraviolet Line Emission of Cool Stars: Implications for Exoplanet Transit Observations
• HAZMAT III: The UV Evolution of Mid- to Late-M Stars with GALEX
• The Solar Neighborhood. XXXIV. A Search for Planets Orbiting Nearby M Dwarfs using Astrometry
• Spot patterns and differential rotation in the eclipsing pre-CV binary,V471 Tau
• The K Dwarf Advantage for Biosignatures on Directly Imaged Exoplanets
• The Near-Ultraviolet Luminosity Function of Young, Early M-Type Dwarf Stars
• Strong HI Lyman-$\alpha$ variations from the 11 Gyr-old host star Kepler-444: a planetary origin ?
• Fundamental Properties of Co-Moving Stars observed by $Gaia$
• A Catalog of GALEX Ultraviolet Emission from Spectroscopically Confirmed M Dwarfs
• HAZMAT. V. The Ultraviolet and X-ray Evolution of K Stars
• Accurate parameters for HD 209458 and its planet from HST spectrophotometry
• HAZMAT II: Ultraviolet Variability of Low-Mass Stars in the GALEX Archive
• Parallax Results From URAT Epoch Data
• Lyman-alpha in the GJ 1132 System: Stellar Emission and Planetary Atmospheric Evolution
• Predicting Lyman-alpha and Mg II Fluxes from K and M Dwarfs Using GALEX Ultraviolet Photometry
• X-ray emission from the super-Earth host GJ 1214
• Nearby Young, Active, Late-type Dwarfs in Gaia's First Data Release
• The UV spectrum of the Ultracool Dwarf LSR J1835+3259 observed with the Hubble Space Telescope

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