Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1

Moór, Attila and Ábrahám, Péter and Kóspál, Ágnes and Su, Kate Y L and Rieke, George H and Vida, Krisztián and Cataldi, Gianni and Bódi, Attila and Bognár, Zsófia and Cseh, Borbála and Csörnyei, Géza and Egei, Nóra and Farkas, Anikó and Hanyecz, Ottó and Ignácz, Bernadett and Kalup, Csilla and Könyves-Tóth, Réka and Kriskovics, Levente and Mészáros, László and Pál, András and Ordasi, András and Sárneczky, Krisztián and Seli, Bálint and Sódor, Ádám and Szakáts, Róbert and Vinkó, József and Zsidi, Gabriella (2022) Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 516 (4). pp. 5684-5701. ISSN 0035-8711

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Abstract

Extreme debris discs are characterized by unusually strong mid-infrared excess emission, which often proves to be variable. The warm dust in these discs is of transient nature and is likely related to a recent giant collision occurring close to the star in the terrestrial region. Here we present the results of a 877 d long, gap-free photometric monitoring performed by the Spitzer Space Telescope of the recently discovered extreme debris disc around TYC 4209-1322-1. By combining these observations with other time-domain optical and mid-infrared data, we explore the disc variability of the last four decades with particular emphasis on the last 12 yr. During the latter interval the disc showed substantial changes, the most significant was the brightening and subsequent fading between 2014 and 2018 as outlined in WISE data. The Spitzer light curves outline the fading phase and a subsequent new brightening of the disc after 2018, revealing an additional flux modulation with a period of ~39 d on top of the long-term trend. We found that all these variations can be interpreted as the outcome of a giant collision that happened at an orbital radius of ~0.3 au sometime in 2014. Our analysis implies that a collision on a similar scale could have taken place around 2010, too. The fact that the disc was already peculiarly dust rich 40 yr ago, as implied by IRAS data, suggests that these dust production events belong to a chain of large impacts triggered by an earlier even more catastrophic collision.

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