61 Virginis debris disc

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61 Virginis debris disc

Post by Lazarus on 13th June 2012, 2:33 am

Herschel imaging of 61 Vir: implications for the prevalence of debris in low-mass planetary systems

The Herschel observations imply a debris disc with inclination 77 degrees with an inner edge at ~30 AU. If the planets are coplanar with the disc, this would give true masses 2.6% greater than the minimum masses.

Regarding the planetary system:
Segransan et al. (in prep.) report 142 precise HARPS radial velocities (averaged values per night) of 61 Vir between JD = 53037 and 55948 that confirm the existence of the inner two planets, with parameters consistent with the values of Vogt et al. (2010) (i.e., a 5.1M planet at 0.05AU and a 18.2M planet at 0.218AU). However, the outermost planet (i.e., the 22.9M planet at 0.478AU) has not been confirmed in the HARPS data at this point.

Also the discovery of a debris disc at ~19 AU from HD 20794 (82 Eridani).
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Re: 61 Virginis debris disc

Post by tommi59 on 13th June 2012, 2:56 am

Planet d will go to unconfirmed catalog??
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Re: 61 Virginis debris disc

Post by Lazarus on 13th June 2012, 3:56 pm

Maybe. They do note there was a burst of activity on the star over part of the time range which could have affected their ability to find longer-period planets.

We shall see...
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Re: 61 Virginis debris disc

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