CI Tau - Massive short-period super-Jovian around classical T Tau star?

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CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Sirius_Alpha on 25th May 2016, 9:07 pm

A Candidate Young Massive Planet in Orbit around the Classical T Tauri Star CI Tau
http://arxiv.org/abs/1605.07917

The ~2 Myr old classical T Tauri star CI Tau shows periodic variability in its radial velocity (RV) variations measured at infrared (IR) and optical wavelengths. We find that these observations are consistent with a massive planet in a ~9-day period orbit. These results are based on 71 IR RV measurements of this system obtained over 5 years, and on 26 optical RV measurements obtained over 9 years. CI Tau was also observed photometrically in the optical on 34 nights over ~one month in 2012. The optical RV data alone are inadequate to identify an orbital period, likely the result of star spot and activity induced noise for this relatively small dataset. The infrared RV measurements reveal significant periodicity at ~9 days. In addition, the full set of optical and IR RV measurements taken together phase coherently and with equal amplitudes to the ~9 day period. Periodic radial velocity signals can in principle be produced by cool spots, hot spots, and reflection of the stellar spectrum off the inner disk, in addition to resulting from a planetary companion. We have considered each of these and find the planet hypothesis most consistent with the data. The radial velocity amplitude yields an Msin(i) of ~8.1 M_Jup; in conjunction with a 1.3 mm continuum emission measurement of the circumstellar disk inclination from the literature, we find a planet mass of ~11.3 M_Jup, assuming alignment of the planetary orbit with the disk.

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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Led_Zep on 26th May 2016, 9:19 pm

http://news.rice.edu/2016/05/26/astronomers-find-giant-planet-around-very-young-star/

Press release :

Astronomers find giant planet around very young star
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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Sirius_Alpha on 12th September 2016, 8:34 pm

The origin of the eccentricity of the hot Jupiter in CI Tau
http://arxiv.org/abs/1609.02917

Following the recent discovery of the first radial velocity planet in a star still possessing a protoplanetary disc (CI Tau), we examine the origin of the planet's eccentricity (e ∼0.3). We show through long timescale (105 orbits) simulations that the planetary eccentricity can be pumped by the disc, even when its local surface density is well below the threshold previously derived from short timescale integrations. We show that the disc may be able to excite the planet's orbital eccentricity in < a Myr for the system parameters of CI Tau. We also perform two planet scattering experiments and show that alternatively the observed planet may plausibly have acquired its eccentricity through dynamical scattering of a migrating lower mass planet, which has either been ejected from the system or swallowed by the central star. In the latter case the present location and eccentricity of the observed planet can be recovered if it was previously stalled within the disc's magnetospheric cavity.

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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Sirius_Alpha on 21st January 2018, 9:37 pm

K2 reveals pulsed accretion driven by the 2 Myr old hot Jupiter CI Tau b
https://arxiv.org/abs/1801.06234

CI Tau is a young (~2 Myr) classical T Tauri star located in the Taurus star forming region. Radial velocity observations indicate it hosts a Jupiter-sized planet with an orbital period of approximately 9 days. In this work, we analyze time series of CI Tau's photometric variability as seen by K2. The lightcurve reveals the stellar rotation period to be ~6.6 d. Although there is no evidence that CI Tau b transits the host star, a ~9 d signature is also present in the lightcurve. We believe this is most likely caused by planet-disk interactions which perturb the accretion flow onto the star, resulting in a periodic modulation of the brightness with the ~9 d period of the planet's orbit.

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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Sirius_Alpha on 21st May 2018, 9:03 pm

Probing Signatures of a Distant Planet around the Young T-Tauri Star CI Tau Hosting a Possible Hot Jupiter
https://arxiv.org/abs/1805.07498

We search for signatures of a distant planet around the two-million-year-old classical T-Tauri star CI Tau hosting a hot Jupiter candidate (M_{p} sin{i} ~ 8.1 M_{Jupiter}) in an eccentric orbit (e ~0.3). To probe the existence of an outer perturber, we reanalyzed 1.3 mm dust continuum observations of the protoplanetary disk around CI Tau obtained by the Atacama Large Millimeter/submillimeter Array. We found a gap structure at ~0".8 in CI Tau's disk. Our visibility fitting assuming an axisymmetric surface brightness profile suggested that the gap is located at a deprojected radius of 104.5+/-1.6 au and has a width of 36.9+/-2.9 au. The brightness temperature around the gap was calculated to be ~2.3 K lower than that of the ambient disk. Gap-opening mechanisms such as secular gravitational instability and dust trapping can explain the gap morphology in the CI Tau disk. The scenario that an unseen planet created the observed gap structure cannot be ruled out, although the coexistence of an eccentric hot Jupiter and a distant planet around the young CI Tau would be challenging for gravitational scattering scenarios. The mass of the planet was estimated to be between ~0.25 M_{Jupiter} and ~0.8 M_{Jupiter} from the gap width and depth (0.41 +0.04/-0.06) in the modeled surface brightness image, which is lower than the current detection limits of high-contrast direct imaging. The young classical T-Tauri CI Tau may be a unique system to explore the existence of a potential distant planet as well as the origin of an eccentric hot Jupiter.

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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Lazarus on 22nd May 2018, 3:27 pm

Hopefully this one doesn't go the way of PTFO 8-8695 / CVSO 30.
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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

Post by Lazarus on 24th September 2018, 9:59 am

ALMA observations show a multi-ringed disc, which might be the result of multiple outer planets. The scenario that they use to explain it are sub-Jovian planets of 0.75, 0.15 and 0.4 Jupiter masses at 14, 43 and 108 AU.

Clarke et al. "High resolution millimetre imaging of the CI Tau protoplanetary disc - a massive ensemble of protoplanets from 0.1 - 100 au"
https://arxiv.org/abs/1809.08147
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Re: CI Tau - Massive short-period super-Jovian around classical T Tau star?

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