Publications (34)
TOI-6478 b: a cold under-dense Neptune transiting a fully convective M dwarf from the thick disc
Madison G. Scott, Amaury H. M. J. Triaud, Khalid Barkaoui +25
Growing numbers of exoplanet detections continue to reveal the diverse nature of planetary systems. Planet formation around late-type M dwarfs is of particular interest. These syst…
A transit timing variation observed for the long-period extremely low density exoplanet HIP 41378f
Edward M. Bryant, Daniel Bayliss, Alexandre Santerne +47
HIP 41378 f is a temperate planet with period of 542.08 days and an extremely low density of g cm. It transits the bright star HIP 41378…
The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2
Alison Duck, David V. Martin, Sam Gill +23
M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterisati…
A transiting giant planet in orbit around a 0.2-solar-mass host star
Edward M. Bryant, Andrés Jordán, Joel D. Hartman +56
Planet formation models suggest that the formation of giant planets is significantly harder around low-mass stars, due to the scaling of protoplanetary disc masses with stellar mas…
Infrared photometry with InGaAs detectors: First light with SPECULOOS
Peter P. Pedersen, Didier Queloz, Lionel Garcia +15
We present the photometric performance of SPIRIT, a ground-based near-infrared InGaAs CMOS-based instrument (1280 by 1024 pixels, 12 micron pitch), using on-sky results from the SP…
Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system
Matthew R. Standing, Lalitha Sairam, David V. Martin +24
We report the detection of a gas-giant planet in orbit around both stars of an eclipsing binary star system that also contains the smaller, inner transiting planet TOI-1338b. The n…
NGTS clusters survey -- III: A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary
Gareth D. Smith, Edward Gillen, Didier Queloz +27
We present the discovery and characterisation of an eclipsing binary identified by the Next Generation Transit Survey in the 115 Myr old Blanco 1 open cluster. NGTS J0002-29…
TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136
Tianjun Gan, Abderahmane Soubkiou, Sharon X. Wang +60
We present the discovery of TOI-2136b, a sub-Neptune planet transiting every 7.85 days a nearby M4.5V-type star, identified through photometric measurements from the TESS mission.…
The L 98-59 System: Three Transiting, Terrestrial-Sized Planets Orbiting a Nearby M-dwarf
Veselin B. Kostov, Joshua E. Schlieder, Thomas Barclay +112
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-sized planets transiting L 98-59 (TOI-175, TIC 307210830) -- a bright M dwarf at a distanc…
An Eclipsing Substellar Binary in a Young Triple System discovered by SPECULOOS
Amaury H. M. J. Triaud, Adam J. Burgasser, Artem Burdanov +18
Mass, radius, and age are three of the most fundamental parameters for celestial objects, enabling studies of the evolution and internal physics of stars, brown dwarfs, and planets…
A 1.55 R habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole
Georgina Dransfield, Mathilde Timmermans, Amaury H. M. J. Triaud +48
A new generation of observatories is enabling detailed study of exoplanetary atmospheres and the diversity of alien climates, allowing us to seek evidence for extraterrestrial biol…
BEBOP VIII. SOPHIE radial velocities reveal an eccentric, circumbinary brown dwarf
Amaury H. M. J. Triaud, Thomas A. Baycroft, Neda Heidari +18
Circumbinary configurations offer a test of planet formation in an altered environment, where the inner binary has perturbed a protoplanetary disc. Comparisons of the physical and…
Functional a posteriori error estimates for boundary element methods
Stefan Kurz, Dirk Pauly, Dirk Praetorius +2
Functional error estimates are well-established tools for a posteriori error estimation and related adaptive mesh-refinement for the finite element method (FEM). The present work p…
Saltire -- A model to measure dynamical masses for high-contrast binaries and exoplanets with high-resolution spectroscopy
Daniel Sebastian, Amaury H. M. J. Triaud, Matteo Brogi
High-resolution cross-correlation methods are widely used to discover and to characterise atomic and molecular species in exoplanet atmospheres. The characteristic cross-correlatio…
Near-resonance in a system of sub-Neptunes from TESS
Samuel N. Quinn, Juliette C. Becker, Joseph E. Rodriguez +78
We report the Transiting Exoplanet Survey Satellite () detection of a multi-planet system orbiting the K0 dwarf TOI 125. We find evidence for up to five planets, wit…
Unraveling the Brown Dwarf Desert: Four New Discoveries and a Unifying, Period-Coded Picture
Ján Šubjak, Rafael Brahm, Jozef Lipták +30
We present four newly validated transiting brown dwarfs identified through TESS photometry and confirmed with high-precision radial velocity measurements obtained from the FEROS an…
Astra: an open-source fully autonomous robotic observatory control software
Peter P. Pedersen, David Degen, Lionel Garcia +12
Astra is an open‑source, cross‑platform Python system that enables fully autonomous operation of astronomical observatories without external message‑broker infrastructure, handling…
New methods for radial-velocity measurements of double-lined binaries, and detection of a circumbinary planet orbiting TIC 172900988
Lalitha Sairam, Amaury H. M. J. Triaud, Thomas A. Baycroft +8
Ongoing ground-based radial-velocity observations seeking to detect circumbinary planets focus on single-lined binaries even though over nine in every ten binary systems in the sol…
Earth: a 3.14-day Earth-sized Planet from 's Kitchen Served Warm by the SPECULOOS Team
Prajwal Niraula, Julien de Wit, Benjamin V. Rackham +25
We report on the discovery of a transiting Earth-sized (0.95) planet around an M3.5 dwarf star at 57pc, K2-315b. The planet has a period of 3.14 days, i.e. ${\s…
BEBOP V. Homogeneous Stellar Analysis of Potential Circumbinary Planet Hosts
Alix V. Freckelton, Daniel Sebastian, Annelies Mortier +29
Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed vie…
ASTEP confirmation of a pair of long-period Jupiter-sized planets with extremely low densities transiting TOI-791
Georgina Dransfield, Antoine C. Petit, Amaury H. M. J. Triaud +45
Gas giant planets with periods orbiting Sun-like stars are a relatively uncommon outcome of planetary formation, and key questions about the nature and form…
Detection of an Earth-sized exoplanet orbiting the nearby ultracool dwarf star SPECULOOS-3
Michaël Gillon, Peter P. Pedersen, Benjamin V. Rackham +81
Located at the bottom of the main sequence, ultracool dwarf stars are widespread in the solar neighbourhood. Nevertheless, their extremely low luminosity has left their planetary p…
The K2-ESPRINT Project II: Spectroscopic follow-up of three exoplanet systems from Campaign 1 of K2
Vincent Van Eylen, Grzegorz Nowak, Simon Albrecht +20
We report on Doppler observations of three transiting planet candidates that were detected during Campaign 1 of the K2 mission. The Doppler observations were conducted with FIES, H…
BEBOP VII. SOPHIE discovery of BEBOP-3b, a circumbinary giant planet on an eccentric orbit
Thomas A. Baycroft, Alexandre Santerne, Amaury H. M. J. Triaud +21
Planetary systems orbiting close binaries are valuable testing grounds for planet formation and migration models. More detections with good mass measurements are needed. We present…
An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b
Khalid Barkaoui, Francisco J. Pozuelos, Coel Hellier +32
Gas giants transiting bright nearby stars provide crucial insights into planetary system formation and evolution mechanisms. Most of these planets exhibit certain average character…
NGTS-11 c: a transiting Neptune-mass planet interior to the warm Saturn NGTS-11 b
David R. Anderson, Jose I. Vines, Katharine Hesse +56
We report the discovery of NGTS-11 c, a transiting warm Neptune ( d; ; ), in an…
Revised Temperatures For Two Benchmark M-dwarfs -- Outliers No More
David V. Martin, Tayt Armitage, Alison Duck +7
Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2:…
Identifying A-stars in the CoRoT-fields IRa01, LRa01 and LRa02
Daniel Sebastian, Eike W. Guenther
Up to now, planet search programs have concentrated on main sequence stars later than spectral type F5. However, identifying planets of early type stars would be interesting. For e…
The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit
Yasmin T. Davis, Amaury H. M. J. Triaud, Alix V. Freckelton +17
In the hunt for Earth-like exoplanets it is crucial to have reliable host star parameters, as they have a direct impact on the accuracy and precision of the inferred parameters for…
Complex Modulation of Rapidly Rotating Young M Dwarfs: Adding Pieces to the Puzzle
Maximilian N. Günther, David A. Berardo, Elsa Ducrot +37
New sets of young M dwarfs with complex, sharp-peaked, and strictly periodic photometric modulations have recently been discovered with Kepler/K2 (scallop shells) and TESS (complex…
BEBOP VI. Enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction
Lalitha Sairam, Thomas A. Baycroft, Isabelle Boisse +13
Circumbinary planets - planets that orbit both stars in a binary system - offer the opportunity to study planet formation and orbital migration in a different environment compare t…
SPECULOOS Northern Observatory: searching for red worlds in the northern skies
Artem Y. Burdanov, Julien de Wit, Michaël Gillon +14
SPECULOOS is a ground-based transit survey consisting of six identical 1-m robotic telescopes. The immediate goal of the project is to detect temperate terrestrial planets transiti…
An M dwarf accompanied by a close-in giant orbiter with SPECULOOS
Amaury H. M. J. Triaud, Georgina Dransfield, Taiki Kagetani +40
In the last decade, a dozen close-in giant planets have been discovered orbiting stars with spectral types ranging from M0 to M4, a mystery since known formation pathways do not pr…
A long-period transiting substellar companion in the super-Jupiters to brown dwarfs mass regime and a prototypical warm-Jupiter detected by TESS
Matias I. Jones, Yared Reinarz, Rafael Brahm +48
We report on the confirmation and follow-up characterization of two long-period transiting substellar companions on low-eccentricity orbits around TIC 4672985 and TOI-2529, whose t…