No Disk at Zeta2 Reticuli?

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No Disk at Zeta2 Reticuli?

Post by Sirius_Alpha on 4th September 2018, 10:47 pm

Is there really a debris disc around ζ2Reticuli?
https://arxiv.org/abs/1809.00645

The presence of a debris disc around the Gyr-old solar-type star ζ2Reticuli was suggested by the Spitzer infrared excess detection. Follow-up observations with Herschel/PACS revealed a double-lobed feature, that displayed asymmetries both in brightness and position. Therefore, the disc was thought to be edge-on and significantly eccentric. Here we present ALMA/ACA observations in Band 6 and 7 which unambiguously reveal that these lobes show no common proper motion with ζ2Reticuli. In these observations, no flux has been detected around ζ2Reticuli that exceeds the 3σ levels. We conclude that surface brightness upper limits of a debris disc around ζ2Reticuli are 5.7μJy/arcsec2 at 1.3 mm, and 26μJy/arcsec2 at 870 microns. Our results overall demonstrate the capability of the ALMA/ACA to follow-up Herschel observations of debris discs and clarify the effects of background confusion.

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Re: No Disk at Zeta2 Reticuli?

Post by Lazarus on 5th September 2018, 1:15 pm

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