Herschel Observations of Disks around Late-type Stars

Abstract

A set of twenty late-type (K5-M5) stars were observed with the Herschel Space Observatory at 100 and 160 microns with the goal of searching for far-infrared excesses indicative of the presence of circumstellar disks. Out of this sample, four stars (TYC 7443-1102-1, TYC 9340-437-1, GJ 784 and GJ 707) have infrared excesses above their stellar photospheres at either 100 or 160 micron or both. At 100 microns TYC 9340-437-1 is spatially resolved with a shape that suggests it is surrounded by a face-on disk. The 100 micron excess flux associated with GJ 707 is marginal at around 3sigma. The excess flux associated with GJ 784 is most likely due to a background galaxy as the dust radius estimated from the spectral energy fit implies that any associated dust disk should have been resolved in the Herschel images but is not. TYC 7443-1102-1 has been observed with ALMA which resolves the emission at its location into two distinct sources making the Herschel excess most likely also due to a background galaxy. It is worth noting that this star is in the 23 Myr old beta Pic association. With a disk luminosity on the order of 10^-3 L*, this system is an ideal follow-up target for high-contrast imaging and ALMA.

Accepted for publication in PASP

References in corpus (19)

• Debris Disk Evolution Around A Stars
• On the age of the $\beta$ Pictoris moving group
• A Stellar Census of the Tucana-Horologium Moving Group
• New Debris Disks Around Nearby Main Sequence Stars: Impact on The Direct Detection of Planets
• Rapid Formation of Gas Giant Planets around M Dwarf Stars
• SONS: The JCMT legacy survey of debris discs in the submillimetre
• Does the presence of planets affect the frequency and properties of extrasolar Kuiper Belts? Results from the Herschel DEBRIS and DUNES surveys
• Gas and dust in the Beta Pictoris Moving Group as seen by the Herschel Space Observatory
• Pebble-driven planet formation for TRAPPIST-1 and other compact systems
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• Correlations between the stellar, planetary and debris components of exoplanet systems observed by $\text{Herschel}$
• Planet formation around stars of various masses: Hot super-Earths
• Search for Cold Debris Disks around M-dwarfs
• The Pointing System of the Herschel Space Observatory. Description, Calibration, Performance and Improvements
• A New M Dwarf Debris Disk Candidate in a Young Moving Group Discovered with Disk Detective
• Spitzer Far-Infrared Detections of Cold Circumstellar Disks
• Extragalactic number counts at 100 um, free from cosmic variance
• A Dusty M5 Binary in the beta Pictoris Moving Group
• Herschel Observations and Updated Spectral Energy Distributions of Five Sunlike Stars with Debris Disks

Cited by in corpus (3)

• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) II. The radial structure of debris discs
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) V: Comparison between scattered light and thermal emission
• ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin