Herschel Observations of Disks around Late-type Stars

Tanner, Angelle; Plavchan, Peter; Bryden, Geoff; Kennedy, Grant; Matra, Luca; Cronin-Coltsmann, Patrick; Lowrance, Patrick; Henry, Todd; Riaz, Basmah; Gizis, John E.; Riedel, Adric und Choquet, Elodie (2020): Herschel Observations of Disks around Late-type Stars. In: Publications of the Astronomical Society of the Pacific, Bd. 132, Nr. 1014, 084401

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 mu m 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 mu m excess flux associated with GJ 707 is marginal at around 3 sigma. 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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-6280
• Sprache: Englisch