Publications by Suzanne Aigrain


The K2 M67 Study: A Curiously Young Star in an Eclipsing Binary in an Old Open Cluster

ASTRONOMICAL JOURNAL 155 (2018) ARTN 152

EL Sandquist, RD Mathieu, SN Quinn, ML Pollack, DW Latham, TM Brown, R Esselstein, S Aigrain, H Parviainen, A Vanderburg, D Stello, G Somers, MH Pinsonneault, J Tayar, JA Orosz, LR Bedin, M Libralato, L Malavolta, D Nardiello


A Universal Spin-Mass Relation for Brown Dwarfs and Planets

Astrophysical Journal 859 (2018)

A Scholz, K Moore, R Jayawardhana, S Aigrain, D Peterson, B Stelzer

© 2018. The American Astronomical Society. All rights reserved. While brown dwarfs show similarities to stars early in their lives, their spin evolutions are much more akin to those of planets. We have used light curves from the K2 mission to measure new rotation periods for 18 young brown dwarfs in the Taurus star-forming region. Our sample spans masses from 0.02 to 0.08 Moand has been characterized extensively in the past. To search for periods, we utilize three different methods (autocorrelation, periodogram, Gaussian processes). The median period for brown dwarfs with disks is twice as long as for those without (3.1 versus 1.6 days), a signature of rotational braking by the disk, albeit with small numbers. With an overall median period of 1.9 days, brown dwarfs in Taurus rotate slower than their counterparts in somewhat older (3-10 Myr) star-forming regions, consistent with spin-up of the latter due to contraction and angular momentum conservation, a clear sign that disk braking overall is inefficient and/or temporary in this mass domain. We confirm the presence of a linear increase of the typical rotation period as a function of mass in the substellar regime. The rotational velocities, when calculated forward to the age of the solar system, assuming angular momentum conservation, fit the known spin-mass relation for solar system planets and extra-solar planetary-mass objects. This spin-mass trend holds over six orders of magnitude in mass, including objects from several different formation paths. Our result implies that brown dwarfs by and large retain their primordial angular momentum through the first few Myr of their evolution.


The GTC exoplanet transit spectroscopy survey VIII. Flat transmission spectrum for the warm gas giant WASP-80b

ASTRONOMY & ASTROPHYSICS 609 (2018) ARTN A33

H Parviainen, E Palle, G Chen, L Nortmann, F Murgas, G Nowak, S Aigrain, A Booth, M Abazorius, N Iro


The K2 M67 Study: Establishing the Limits of Stellar Rotation Period Measurements in M67 with K2 Campaign 5 Data

ASTROPHYSICAL JOURNAL 859 (2018) ARTN 167

R Esselstein, S Aigrain, A Vanderburg, JC Smith, S Meibom, J Van Saders, R Mathieu


Robust, open-source removal of systematics in Kepler data

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) 759-769

S Aigrain, H Parviainen, S Roberts, S Reece, T Evans


New Low-mass Eclipsing Binary Systems in Praesepe Discovered by K2

ASTROPHYSICAL JOURNAL 849 (2017)

E Gillen, LA Hillenbrand, TJ David, S Aigrain, L Rebull, J Stauffer, AM Cody, D Queloz


A deeper view of the CoRoT-9 planetary system A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering

ASTRONOMY & ASTROPHYSICS 603 (2017) ARTN A43

AS Bonomo, G Hebrard, SN Raymond, F Bouchy, AL des Etangs, P Borde, S Aigrain, J-M Almenara, R Alonso, J Cabrera, S Csizmadia, C Damiani, HJ Deeg, M Deleuil, RF Diaz, A Erikson, M Fridlund, D Gandolfi, E Guenther, T Guillot, A Hatzes, A Izidoro, C Lovis, C Moutou, M Ollivier, M Paetzold, H Rauer, D Rouan, A Santerne, J Schneider


Pinning down the mass of Kepler-10c: the importance of sampling and model comparison

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) L125-L130

V Rajpaul, LA Buchhave, S Aigrain


Radial-velocity fitting challenge II. First results of the analysis of the data set

ASTRONOMY & ASTROPHYSICS 598 (2017) ARTN A133

X Dumusque, F Borsa, M Damasso, RF Diaz, PC Gregory, NC Hara, A Hatzes, V Rajpaul, M Tuomi, S Aigrain, G Anglada-Escude, AS Bonomo, G Boue, F Dauvergne, G Frustagli, P Giacobbe, RD Haywood, HRA Jones, J Laskar, M Pinamonti, E Poretti, M Rainer, D Segransan, A Sozzetti, S Udry


CoRoT 223992193: Investigating the variability in a low-mass, pre-main sequence eclipsing binary with evidence of a circumbinary disk

ASTRONOMY & ASTROPHYSICS 599 (2017) ARTN A27

E Gillen, S Aigrain, C Terquem, J Bouvier, SHP Alencar, D Gandolfi, J Stauffer, A Cody, L Venuti, P Viana Almeida, G Micela, F Favata, HJ Deeg


Beyond the Kepler/K2 bright limit: variability in the seven brightest members of the Pleiades

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471 (2017) 2882-2901

TR White, BJS Pope, V Antoci, PI Papics, C Aerts, DR Gies, K Gordon, D Huber, GH Schaefer, S Aigrain, S Albrecht, T Barclay, G Barentsen, PG Beck, TR Bedding, MF Andersen, F Grundahl, SB Howell, MJ Ireland, SJ Murphy, MB Nielsen, VS Aguirre, PG Tuthill


A Low-mass Exoplanet Candidate Detected by K2 Transiting the Praesepe M Dwarf JS 183

ASTRONOMICAL JOURNAL 153 (2017) ARTN 177

J Pepper, E Gillen, H Parviainen, LA Hillenbrand, AM Cody, S Aigrain, J Stauffer, FJ Vrba, T David, J Lillo-Box, KG Stassun, KE Conroy, BJS Pope, D Barrado


A CONSISTENT RETRIEVAL ANALYSIS OF 10 HOT JUPITERS OBSERVED IN TRANSMISSION

ASTROPHYSICAL JOURNAL 834 (2017) ARTN 50

JK Barstow, S Aigrain, PGJ Irwin, DK Sing


Kepler observations of the asteroseismic binary HD 176465

ASTRONOMY & ASTROPHYSICS 601 (2017) ARTN A82

TR White, O Benomar, VS Aguirre, WH Ball, TR Bedding, WJ Chaplin, J Christensen-Dalsgaard, RA Garcia, L Gizon, D Stello, S Aigrain, HM Antia, T Appourchaux, M Bazot, TL Campante, OL Creevey, GR Davies, YP Elsworth, P Gaulme, R Handberg, S Hekker, G Houdek, R Howe, D Huber, C Karoff, JP Marques, S Mathur, A McQuillan, TS Metcalfe, B Mosser, MB Nielsen, C Regulo, D Salabert, T Stahn


HST HOT-JUPITER TRANSMISSION SPECTRAL SURVEY: CLEAR SKIES FOR COOL SATURN WASP-39b

ASTROPHYSICAL JOURNAL 827 (2016) ARTN 19

PD Fischer, HA Knutson, DK Sing, GW Henry, MW Williamson, JJ Fortney, AS Burrows, T Kataria, N Nikolov, AP Showman, GE Ballester, J-M Desert, S Aigrain, D Deming, AL des Etangs, A Vidal-Madjar


ROTATION IN THE PLEIADES WITH K2. I. DATA AND FIRST RESULTS

ASTRONOMICAL JOURNAL 152 (2016) ARTN 113

LM Rebull, JR Stauffer, J Bouvier, AM Cody, LA Hillenbrand, DR Soderblom, J Valenti, D Barrado, H Bouy, D Ciardi, M Pinsonneault, K Stassun, G Micela, S Aigrain, F Vrba, G Somers, J Christiansen, E Gillen, AC Cameron


A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion.

Nature 529 (2016) 59-62

DK Sing, JJ Fortney, N Nikolov, HR Wakeford, T Kataria, TM Evans, S Aigrain, GE Ballester, AS Burrows, D Deming, J-M Désert, NP Gibson, GW Henry, CM Huitson, HA Knutson, AL des Etangs, F Pont, AP Showman, A Vidal-Madjar, MH Williamson, PA Wilson

Thousands of transiting exoplanets have been discovered, but spectral analysis of their atmospheres has so far been dominated by a small number of exoplanets and data spanning relatively narrow wavelength ranges (such as 1.1-1.7 micrometres). Recent studies show that some hot-Jupiter exoplanets have much weaker water absorption features in their near-infrared spectra than predicted. The low amplitude of water signatures could be explained by very low water abundances, which may be a sign that water was depleted in the protoplanetary disk at the planet's formation location, but it is unclear whether this level of depletion can actually occur. Alternatively, these weak signals could be the result of obscuration by clouds or hazes, as found in some optical spectra. Here we report results from a comparative study of ten hot Jupiters covering the wavelength range 0.3-5 micrometres, which allows us to resolve both the optical scattering and infrared molecular absorption spectroscopically. Our results reveal a diverse group of hot Jupiters that exhibit a continuum from clear to cloudy atmospheres. We find that the difference between the planetary radius measured at optical and infrared wavelengths is an effective metric for distinguishing different atmosphere types. The difference correlates with the spectral strength of water, so that strong water absorption lines are seen in clear-atmosphere planets and the weakest features are associated with clouds and hazes. This result strongly suggests that primordial water depletion during formation is unlikely and that clouds and hazes are the cause of weaker spectral signatures.


Telling twins apart: exo-Earths and Venuses with transit spectroscopy

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458 (2016) 2657-2666

JK Barstow, S Aigrain, PGJ Irwin, S Kendrew, LN Fletcher


NEW PLEIADES ECLIPSING BINARIES AND A HYADES TRANSITING SYSTEM IDENTIFIED BY K2

ASTRONOMICAL JOURNAL 151 (2016) ARTN 112

TJ David, KE Conroy, LA Hillenbrand, KG Stassun, J Stauffer, LM Rebull, AM Cody, H Isaacson, AW Howard, S Aigrain


K2SC: flexible systematics correction and detrending of K2 light curves using Gaussian process regression

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 459 (2016) 2408-2419

S Aigrain, H Parviainen, BJS Pope

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