SIMBAD references

2019ApJ...872...92F - Astrophys. J., 872, 92-92 (2019/February-2)

The planet formation potential around a 45 Myr old accreting M dwarf.


Abstract (from CDS):

Debris disk detections around M dwarfs are rare, and so far no gas emission has been detected from an M dwarf debris disk. This makes the 45 Myr old M dwarf WISE J080822.18-644357.3 a bit of a curiosity; it has a strong infrared excess at an age beyond the lifetime of a typical planet-forming disk, and also exhibits broad Hα emission consistent with active accretion from a gaseous disk. To better understand the cold gas and dust properties of this system, we obtained ALMA observations of the 1.3 mm continuum and the CO/13CO/C18O J = 2-1 emission lines. No cold CO gas is detected from this system, ruling out a gas-rich protoplanetary disk. Unresolved dust continuum emission is detected at a flux of 198 ± 15 µJy, consistent with 0.057 ± 0.006 M worth of optically thin dust, and consistent with being generated through a collisional cascade induced by large bodies at radii <16 au. With a sufficiently strong stellar wind, dust grains released in the outer disk can migrate inward via PR drag, potentially serving as a source of grains for the strong infrared excess.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): circumstellar matter - stars: individual: WISE J080822.18-644357.3 - submillimeter: planetary systems

Simbad objects: 11

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