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 PDS 110 - A 1SWASP J1407's analogue?

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Edasich
dK star
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Edasich


Number of posts : 2289
Location : Tau Ceti g - Mid Latitudes
Registration date : 2008-06-02

PDS 110 - A 1SWASP J1407's analogue? Empty
PostSubject: PDS 110 - A 1SWASP J1407's analogue?   PDS 110 - A 1SWASP J1407's analogue? Empty20th October 2017, 9:57 am

Hasn't this one been noticed? A possible transiting ringed substellar object in Orion OB1a orbiting a warmer star than 1SWASP J1407.

Periodic Eclipses of the Young Star PDS 110 Discovered with WASP and KELT Photometry

Quote :
We report the discovery of eclipses by circumstellar disc material associated with the young star PDS 110 in the Ori OB1a association using the SuperWASP and KELT surveys. PDS 110 (HD 290380, IRAS 05209-0107) is a rare Fe/Ge-type star, a ~10 Myr-old accreting intermediate-mass star showing strong infrared excess (LIR/Lbol ~ 0.25). Two extremely similar eclipses with a depth of ~30\% and duration ~25 days were observed in November 2008 and January 2011. We interpret the eclipses as caused by the same structure with an orbital period of 808±2 days. Shearing over a single orbit rules out diffuse dust clumps as the cause, favouring the hypothesis of a companion at ~2AU. The characteristics of the eclipses are consistent with transits by an unseen low-mass (1.8-70MJup) planet or brown dwarf with a circum-secondary disc of diameter ~0.3 AU. The next eclipse event is predicted to take place in September 2017 and could be monitored by amateur and professional observatories across the world.
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Lazarus
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Number of posts : 3337
Registration date : 2008-06-12

PDS 110 - A 1SWASP J1407's analogue? Empty
PostSubject: Re: PDS 110 - A 1SWASP J1407's analogue?   PDS 110 - A 1SWASP J1407's analogue? Empty13th November 2018, 6:49 pm

Unfortunately, the predicted eclipse did not take place. From http://pds110.hughosborn.co.uk

Quote :
As anyone following the observing campaign will realise, it has not gone quite as expected… The lightcurve remains flat and without any hint of the ~30%-deep eclipse we predicted.

To be frank, we got it wrong. We can now say that the eclipses seen in 2008 & 2011 around PDS 110 were not made by a periodic object, or at least, not one with dust that stuck around over 6 years. And we can say that thanks to the many fantastic observations from amateur and professional observers alike! So thanks very much for that.

Although, given recent results on J1407, maybe that doesn't rule it out as being an analogue after all...
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Lazarus
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Number of posts : 3337
Registration date : 2008-06-12

PDS 110 - A 1SWASP J1407's analogue? Empty
PostSubject: Re: PDS 110 - A 1SWASP J1407's analogue?   PDS 110 - A 1SWASP J1407's analogue? Empty24th January 2019, 3:20 pm

Osborn et al. "The PDS 110 observing campaign - photometric and spectroscopic observations reveal eclipses are aperiodic"
https://arxiv.org/abs/1901.07981

More details on the non-detection of the predicted eclipse. They did observe other dips, possibly suggesting that the dimming is caused by material being blown out of the disc plane, a similar mechanism to that proposed for UX Orionis variables.
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PDS 110 - A 1SWASP J1407's analogue? Empty
PostSubject: Re: PDS 110 - A 1SWASP J1407's analogue?   PDS 110 - A 1SWASP J1407's analogue? Empty

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