A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star (V830 Tau)

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A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star (V830 Tau)

Post by Led_Zep on 20th June 2016, 6:22 pm


http://www.nature.com/nature/journal/vaop/ncurrent/full/nature18305.html

Here we report that the radial velocities of the young star V830 Tau exhibit a sine wave of period 4.93 days and semi-amplitude 75 metres per second, detected with a false-alarm probability of less than 0.03 per cent, after filtering out the magnetic activity plaguing the spectra. We find that this signal is unrelated to the 2.741-day rotation period of V830 Tau and we attribute it to the presence of a planet of mass 0.77 times that of Jupiter, orbiting at a distance of 0.057 astronomical units from the host star. Our result demonstrates that hot Jupiters can migrate inwards in less than two million years, probably as a result of planet–disk interactions

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Re: A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star (V830 Tau)

Post by Led_Zep on 20th June 2016, 10:37 pm

Paper on arXiv :
http://arxiv.org/abs/1606.06236

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Re: A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star (V830 Tau)

Post by Sirius_Alpha on 7th November 2016, 9:34 pm

The hot Jupiter of the magnetically-active weak-line T Tauri star V830 Tau
https://arxiv.org/abs/1611.02055

We report results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star V830 Tau and its recently-detected newborn close-in giant planet. Our observations, carried out within the MaTYSSE programme, were spread over 91d, and involved the ESPaDOnS and Narval spectropolarimeters linked to the 3.6m Canada-France-Hawaii, the 2m Bernard Lyot and the 8-m Gemini-North Telescopes. Using Zeeman-Doppler Imaging, we characterize the surface brightness distributions, magnetic topologies and surface differential rotation of V830 Tau at the time of our observations, and demonstrate that both distributions evolve with time beyond what is expected from differential rotation. We also report that near the end of our observations, V830 Tau triggered one major flare and two weaker precursors, showing up as enhanced red-shifted emission in multiple spectral activity proxies. With 3 different filtering techniques, we model the radial velocity (RV) activity jitter (of semi-amplitude 1.2km/s) that V830 Tau generates, successfully retrieve the 68m/s RV planet signal hiding behind the jitter, further confirm the existence of V830 Tau b and better characterize its orbital parameters. We find that the method based on Gaussian-process regression performs best thanks to its higher ability at modelling not only the activity jitter, but also its temporal evolution over the course of our observations, and succeeds at reproducing our RV data down to a rms precision of 35m/s. Our result provides new observational constraints on scenarios of star / planet formation and demonstrates the scientific potential of large-scale searches for close-in giant planets around T Tauri stars.

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Re: A hot Jupiter orbiting a 2-million-year-old solar-mass T Tauri star (V830 Tau)

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