A5014581049- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Spectroscopy and Laser Applications
- Geological and Tectonic Studies in Latin America
- Pulsars and Gravitational Waves Research
- Space Exploration and Technology
- Planetary Science and Exploration
- Plant and animal studies
- Archaeological and Historical Studies
- Plant Pathogens and Resistance
- Photosynthetic Processes and Mechanisms
- History and Developments in Astronomy
- Superconducting and THz Device Technology
- SAS software applications and methods
- Adaptive optics and wavefront sensing
University of Liège
2024
University of Bern
2024
Astronomical Observatory of Rome
2003-2023
Blue Planet (Norway)
2008
The Ohio State University
2008
University of Notre Dame
2008
University of Warsaw
2008
Carter Observatory
2008
Tel Aviv University
2008
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency solar system analogs remains unknown. The gravitational microlensing planet search method is potentially sensitive to multiple-planet systems containing all except Mercury. We report detection a with microlensing. identify two masses ∼0.71 and ∼0.27 times mass Jupiter orbital separations ∼2.3 ∼4.6 astronomical units orbiting primary star ∼0.50 at distance ∼1.5 kiloparsecs. This...
We present the first measurement of planet frequency beyond "snow line," for planet-to-star mass-ratio interval −4.5 < log q −2, corresponding to range ice giants gas giants. find at mean mass ratio = 5 × 10−4 with no discernible deviation from a flat (Öpik's law) distribution in log-projected separation s. The determination is based on sample six planets detected intensive follow-up observations high-magnification (A>200) microlensing events during 2005–2008. sampled host stars have typical...
We present the discovery of a Neptune-mass planet OGLE-2007-BLG-368Lb with planet–star mass ratio q = [9.5 ± 2.1] × 10−5 via gravitational microlensing. The planetary deviation was detected in real-time thanks to high cadence Microlensing Observations Astrophysics survey, light-curve monitoring and intensive follow-up observations. A Bayesian analysis returns stellar distance at Ml 0.64+0.21−0.26 M☉ Dl 5.9+0.9−1.4 kpc, respectively, so separation are Mp 20+7−8 M⊕ 3.3+1.4−0.8 AU,...
We report on a V = 11.2 early K dwarf, XO-2 (GSC 03413-00005), that hosts Rp 0.98±0.010.03 RJ, Mp 0.57 ± 0.06 MJ transiting extrasolar planet, XO-2b, with an orbital period of 2.615857 0.000005 days. has high metallicity, [Fe/H ] 0.45 0.02, proper motion, μtot 157 mas yr−1, and common motion stellar companion 31'' separation. The two stars are nearly identical twins, very similar spectra apparent magnitudes. Due to the these dwarf have mass radius close solar, M⋆ 0.98 0.02 M☉ R⋆...
We report the discovery of a massive (Mpsini = 13.02 +/- 0.64 Mjup; total mass 13.25 Mjup), large (1.95 0.16 Rjup) planet in transiting, eccentric orbit (e 0.260 0.017) around 10th magnitude F5V star constellation Camelopardalis. designate XO-3b, and XO-3, also known as GSC 03727-01064. The orbital period XO-3b is 3.1915426 0.00014 days. XO-3 lacks trigonometric distance; we estimate its distance to be 260 23 pc. radius 2.13 0.21 Rsun, 1.41 0.08 Msun, vsini 18.54 0.17 km/s, metallicity...
We report the detection of cool, Jovian-mass planet MOA-2007-BLG-400Lb. The was detected in a high-magnification microlensing event (with peak magnification A_max = 628) which primary lens transited source, resulting dramatic smoothing event. angular extent region perturbation due to is significantly smaller than size and as result planetary signature also smoothed out by finite source size. Thus deviation from single-lens fit broad relatively weak (~ few percent). Nevertheless, we...
Aims. We report the discovery of a planet with high planet-to-star mass ratio in microlensing event MOA-2009-BLG-387, which exhibited pronounced deviations over 12-day interval, one longest for any planetary event. The host is an M dwarf, range 0.07 M⊙ < Mhost 0.49 at 90% confidence. planet-star q = 0.0132 ± 0.003 has been measured extremely well, so best-estimated mass, mp 2.6 Jupiter masses median 0.19 M⊙.
We present the first example of binary microlensing for which parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible a confluence two relatively unusual circumstances. First, lens bright enough (I=15.6) to permit measurements. Second, we measure not only usual 7 binary-lens parameters, but also 'microlens parallax' (which yields mass) and components instantaneous orbital velocity. Thus measure, effectively, 6 'Kepler+1' parameters...
We present the discovery and mass measurement of cold, low-mass planet MOA-2009-BLG-266Lb, performed with gravitational microlensing method. This has a mp = 10.4 ± 1.7 M⊕ orbits star M⋆ 0.56 0.09 M☉ at semimajor axis AU an orbital period yrs. The host measurements are enabled by parallax effect, which is seen primarily in light curve distortion due to motion Earth. But analysis also demonstrates capability measure Deep Impact (or EPOXI) spacecraft heliocentric orbit. distance similar...
Abstract We present the discovery and validation of a three-planet system orbiting nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). lies in TESS continuous viewing zone Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R ⊕ to 2.6 orbital periods 9.98 37.43 days. Ground-based follow-up combined diagnostic vetting tests enables us rule out common astrophysical false-positive scenarios validate planets. The outermost planet, d,...
Abstract JWST has ushered in an era of unprecedented ability to characterize exoplanetary atmospheres. While there are over 5000 confirmed planets, more than 4000 Transiting Exoplanet Survey Satellite (TESS) planet candidates still unconfirmed and many the best planets for atmospheric characterization may remain be identified. We present a sample TESS that we identify as “best-in-class” transmission emission spectroscopy with JWST. These targets sorted into bins across equilibrium...
We present a new analysis of the Jupiter+Saturn analog system, OGLE-2006-BLG-109Lb,c, which was first double planet system discovered with gravitational microlensing method. This is only multi-planet by any method measured masses for star and both planets. In addition to signatures two planets, this event also exhibits parallax signature finite source effects that provide direct measure expected brightness host confirmed Keck AO imaging, yielding M_* = 0.51(+0.05-0.04) M_sun, M_b 231+-19...
We report the detection of sub-Saturn-mass planet MOA-2008-BLG-310Lb and argue that it is strongest candidate yet for a bulge planet. Deviations from single-lens fit are smoothed out by finite-source effects so not immediately apparent light curve. Nevertheless, we find model in which primary has planetary companion favored over \Delta\chi^2 ~ 880 an additional three degrees freedom. Detailed analysis yields planet/star mass ratio q=(3.3+/-0.3)x10^{-4} angular separation between star within...
ABSTRACT We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ∼ 1600 on 2008 May 30. The peak this exhibits both finite-source effects and terrestrial parallax, from we determine mass lens, M l = 0.64 ± 0.10 ☉ , its distance, D 4.0 0.6 kpc. rule out Jupiter-mass planetary companions to lens star for projected separations in range 0.5–20 AU. More generally, find that was sensitive planets with masses as small <?CDATA $0.2...
We report the gravitational microlensing discovery of a sub-Saturn mass planet, MOA-2009-BLG-319Lb, orbiting K or M-dwarf star in inner Galactic disk bulge. The high cadence observations MOA-II survey discovered this event and enabled its identification as magnification approximately 24 hours prior to peak magnification. As result, planetary signal at light curve was observed by 20 different telescopes, which is largest number telescopes contribute date. model for indicates planet-star ratio...
We report the discovery of 14 new transiting planet candidates in Kepler field from Planet Hunters citizen science program. None these overlapped with Objects Interest (KOIs) at time submission. one more addition to six candidate system around KOI-351, making it only seven Kepler. Additionally, KOI-351 bears some resemblance our own solar system, inner five planets ranging Earth mini-Neptune radii and outer being gas giants; however, this is very compact, all orbiting $\lesssim 1$ AU their...
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 distance 10.6 pc. Using Gaia-measured and broad-band photometry we find that host star is an M3 dwarf. Combined with TESS transits from sectors, corresponding stellar parameters yield planet radii ranging 0.8REarth to 1.6REarth. All have short orbital periods, 2.25 7.45 days outer pair just wide 2:1 period resonance....
Abstract Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations particularly important because age system is well constrained. We present discovery a transiting planet larger than Neptune but smaller Saturn 45 Myr Tucana–Horologium moving group. The host star visual binary, and our follow-up observations demonstrate orbits G6V primary component, DS Tuc A (HD 222259A, TIC 410214986). first identified transits using photometry from...
Abstract Astronomers do not have a complete picture of the effects wide-binary companions (semimajor axes greater than 100 au) on formation and evolution exoplanets. We investigate these using new data from Gaia Early Data Release 3 Transiting Exoplanet Survey Satellite mission to characterize systems with transiting identify sample 67 exoplanet candidates (with well-determined, edge-on orbital inclinations) that reside in wide visual binary systems. derive limits parameters for measure...
We report the discovery of TOI-700 e, a 0.95 R$_\oplus$ planet residing in Optimistic Habitable Zone (HZ) its host star. This was enabled by multiple years monitoring from NASA's Transiting Exoplanet Survey Satellite (TESS) mission. The star, (TIC 150428135), is nearby (31.1 pc), inactive, M2.5 dwarf ($V_{mag} = 13.15$). already known to three planets, including small, HZ planet, d. new has an orbital period 27.8 days and, based on radius (0.95 R$_\oplus$), it likely rocky. observed for 21...
The main scientific goal of TESS is to find planets smaller than Neptune around stars that are bright enough allow for further characterization studies. Given our current instrumentation and detection biases, M dwarfs prime targets in the search small (or near) habitable zone their host star. In this work, we use photometric observations CARMENES radial velocity (RV) measurements validate a pair transiting planet candidates found by TESS. data were fitted simultaneously, using Bayesian...
A new generation of observatories is enabling detailed study exoplanetary atmospheres and the diversity alien climates, allowing us to seek evidence for extraterrestrial biological geological processes. Now therefore time identify most unique planets be characterised with these instruments. In this context, we report on discovery validation TOI-715 b, a $R_{\rm b}=1.55\pm 0.06\rm R_{\oplus}$ planet orbiting its nearby ($42$ pc) M4 host (TOI-715/TIC 271971130) period $P_{\rm b} =...
The Large Interferometer For Exoplanets (LIFE) is a proposed space mission that enables the spectral characterization of thermal emission exoplanets in solar neighborhood. designed to search for global atmospheric biosignatures on dozens temperate terrestrial and it will naturally investigate diversity other worlds. Here, we review status concept, discuss key parameters, outline trade-offs related mission's architecture. In preparation an upcoming concept study, define baseline based...