Revised mass for 1RXS J1609-2105b

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Revised mass for 1RXS J1609-2105b

Post by Lazarus on 9th December 2011, 2:49 pm

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Re: Revised mass for 1RXS J1609-2105b

Post by Edasich on 10th December 2011, 4:54 am

That of HIP 78350 b is instead estimated around 30 Jupiter masses. I wonder if it is still to be considered a massive planetary outlier.

EPE seems have missed this important paper.
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Re: Revised mass for 1RXS J1609-2105b

Post by Edasich on 30th March 2015, 5:59 am

An update about this and other young stars hosting substellar/planetary companions

Characterization of Low-mass, Wide-separation Substellar Companions to Stars in Upper Scorpius: Near-infrared Photometry and Spectroscopy

We present new 0.9-2.45 μm spectroscopy (R∼1000), and Y, J, H, Ks, L′ photometry, obtained at Gemini North, of three low-mass brown dwarf companions on wide orbits around young stars of the Upper Scorpius OB association: HIP 78530 B, [PGZ2001] J161031.9-191305 B, and GSC 06214-00210 B. We use these data to assess the companions' spectral type, temperature, surface gravity and mass, as well as the ability of the BT-Settl and Drift-Phoenix atmosphere models to reproduce the spectral features of young substellar objects. For completeness, we also analyze the archival spectroscopy and photometry of the Upper Scorpius planetary mass companion 1RXS J160929.1-210524 b. Based on a comparison with model spectra we find that the companions, in the above order, have effective temperatures of 2700, 2500, 2300 and 1700 K. These temperatures are consistent with our inferred spectral types, respectively M7 β, M9 γ, M9 γ, and L4 γ. From bolometric luminosities estimated from atmosphere model spectra adjusted to our photometry, and using evolution models at 5-10 Myr, we estimate masses of 21-25, 28-70, 14-17 and 7-12 MJup, respectively. J1610-1913 B appears significantly over-luminous for its inferred temperature, which explains its higher mass estimate. Synthetic spectra based on the BT-Settl and Drift-Phoenix atmosphere models generally offer a good fit to our observed spectra, although our analysis has highlighted a few problems. For example, the best fits in the individual near-infrared bands occur at different model temperatures. Also, temperature estimates based on a comparison of the broadband magnitudes and colors of the companions to synthetic magnitudes from the models are systematically lower than the temperature estimates based on a comparison with synthetic spectra.

Among these ones USco 1610-1913 b appears to be a circumbinary planet (AB)b.
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Re: Revised mass for 1RXS J1609-2105b

Post by Lazarus on 30th March 2015, 2:13 pm

High mass for J1610-1913 b though, ~60 Jupiters if the 10 Myr age is correct.
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Re: Revised mass for 1RXS J1609-2105b

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