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A survey for variable young stars with small telescopes: II - mapping a protoplanetary disc with stable structures at 0.15 au

Froebrich, Dirk, Evitts, Jack, Scholz, Aleks, Eislöffel, Jochen, Campbell-White, Justyn, Furnell, Will, Urtly, Thomas, Pickard, Roger, Wiersema, Klaas, Dubovský, Pavol A., and others. (2020) A survey for variable young stars with small telescopes: II - mapping a protoplanetary disc with stable structures at 0.15 au. Monthly Notices of the Royal Astronomical Society, 493 (1). pp. 184-198. ISSN 0035-8711. (doi:10.1093/mnras/staa158) (KAR id:80340)

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Abstract

The HOYS citizen science project conducts long term, multifilter, high cadence monitoring of large YSO samples with a wide variety of professional and amateur telescopes. We present the analysis of the light curve of V1490 Cyg in the Pelican Nebula. We show that colour terms in the diverse photometric data can be calibrated out to achieve a median photometric accuracy of 0.02 mag in broadband filters, allowing detailed investigations into a variety of variability amplitudes over timescales from hours to several years. Using Gaia DR2 we estimate the distance to the Pelican Nebula to be 870 +70 −55 pc. V1490 Cyg is a quasi-periodic dipper with a period of 31.447 ± 0.011 d. The obscuring dust has homogeneous properties, and grains larger than those typical in the ISM. Larger variability on short timescales is observed in U and Rc−Hα, with U-amplitudes reaching 3 mag on timescales of hours, indicating the source is accreting. The Hα equivalent width and NIR/MIR colours place V1490 Cyg between CTTS/WTTS and transition disk objects. The material responsible for the dipping is located in a warped inner disk, about 0.15 AU from the star. This mass reservoir can be filled and emptied on time scales shorter than the period at a rate of up to 10−10 M�/yr, consistent with low levels of accretion in other T Tauri stars. Most likely the warp at this separation from the star is induced by a protoplanet in the inner accretion disk. However, we cannot fully rule out the possibility of an AA Tau-like warp, or occultations by the Hill sphere around a forming planet.

Item Type: Article
DOI/Identification number: 10.1093/mnras/staa158
Uncontrolled keywords: stars: individual: V 1490 Cyg, stars: variables: T Tauri, Herbig Ae/Be, stars: formation, pre-main sequence, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculties > Sciences > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Depositing User: Dirk Froebrich
Date Deposited: 03 Mar 2020 10:51 UTC
Last Modified: 09 Sep 2020 09:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/80340 (The current URI for this page, for reference purposes)
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