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Stellar_flare_hits_HD_189733_b_(artist's_impression)

This artist's impression shows the hot Jupiter HD 189733b, as it passes in front of its parent star, as the latter is flaring, driving material away from the planet. The escaping atmosphere is seen silhouetted against the starlight. The surface of the star, which is around 80% the mass of the Sun, is based on observations of the Sun from NASA's Solar Dynamics Observatory.

Credit: NASA, ESA, L. Calçada, Solar Dynamics Observatory

Prof Suzanne Aigrain

Professor of Astrophysics

Research theme

  • Astronomy and astrophysics
  • Exoplanets and planetary physics

Sub department

  • Astrophysics

Research groups

  • Exoplanets and Stellar Physics
Suzanne.Aigrain@physics.ox.ac.uk
Telephone: 01865 (2)73339
Denys Wilkinson Building, room 762
Stars & Planets @ Oxford research group website
  • About
  • Publications

CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk

ArXiv 1311.399 (2013)

Authors:

Edward Gillen, Suzanne Aigrain, Amy McQuillan, Jerome Bouvier, Simon Hodgkin, Silvia HP Alencar, Caroline Terquem, John Southworth, Neale P Gibson, Ann Marie Cody, Monika Lendl, Maria Morales-Calderón, Fabio Favata, John Stauffer, Giuseppina Micela

Abstract:

We present the discovery of CoRoT 223992193, a double-lined, detached eclipsing binary, comprising two pre-main sequence M dwarfs, discovered by the CoRoT space mission during a 23-day observation of the 3 Myr old NGC 2264 star-forming region. Using multi-epoch optical and near-IR follow-up spectroscopy with FLAMES on the Very Large Telescope and ISIS on the William Herschel Telescope we obtain a full orbital solution and derive the fundamental parameters of both stars by modelling the light curve and radial velocity data. The orbit is circular and has a period of $3.8745745 \pm 0.0000014$ days. The masses and radii of the two stars are $0.67 \pm 0.01$ and $0.495 \pm 0.007$ $M_{\odot}$ and $1.30 \pm 0.04$ and $1.11 ~^{+0.04}_{-0.05}$ $R_{\odot}$, respectively. This system is a useful test of evolutionary models of young low-mass stars, as it lies in a region of parameter space where observational constraints are scarce; comparison with these models indicates an apparent age of $\sim$3.5-6 Myr. The systemic velocity is within $1\sigma$ of the cluster value which, along with the presence of lithium absorption, strongly indicates cluster membership. The CoRoT light curve also contains large-amplitude, rapidly evolving out-of-eclipse variations, which are difficult to explain using starspots alone. The system's spectral energy distribution reveals a mid-infrared excess, which we model as thermal emission from a small amount of dust located in the inner cavity of a circumbinary disk. In turn, this opens up the possibility that some of the out-of-eclipse variability could be due to occultations of the central stars by material located at the inner edge or in the central cavity of the circumbinary disk.
Details from ArXiV
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CoRoT 223992193: A new, low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk

(2013)

Authors:

Edward Gillen, Suzanne Aigrain, Amy McQuillan, Jerome Bouvier, Simon Hodgkin, Silvia HP Alencar, Caroline Terquem, John Southworth, Neale P Gibson, Ann Marie Cody, Monika Lendl, Maria Morales-Calderón, Fabio Favata, John Stauffer, Giuseppina Micela
More details from the publisher

HST hot Jupiter transmission spectral survey: detection of water in HAT-P-1b from WFC3 near-IR spatial scan observations

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 435:4 (2013) 3481-3493

Authors:

HR Wakeford, DK Sing, D Deming, NP Gibson, JJ Fortney, AS Burrows, G Ballester, N Nikolov, S Aigrain, G Henry, H Knutson, A Lecavelier des Etangs, F Pont, AP Showman, A Vidal-Madjar, K Zahnle
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Details from ArXiV

Radial Velocity Variations of Photometrically Quiet, Chromospherically Inactive Kepler Stars: A Link Between RV Jitter and Photometric Flicker

(2013)

Authors:

Fabienne A Bastien, Keivan G Stassun, Joshua Pepper, Jason T Wright, Suzanne Aigrain, Gibor Basri, John A Johnson, Andrew W Howard, Lucianne M Walkowicz
More details from the publisher

HST hot Jupiter Transmission Spectral Survey: A detection of Na and strong optical absorption in HAT-P-1b

(2013)

Authors:

N Nikolov, DK Sing, F Pont, AS Burrows, JJ Fortney, GE Ballester, TM Evans, CM Huitson, HR Wakeford, PA Wilson, S Aigrain, D Deming, NP Gibson, GW Henry, H Knutson, A Lecavelier des Etangs, AP Showman, A Vidal-Madjar, K Zahnle
More details from the publisher

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