L. M. Serrano
A5082198786- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Solar and Space Plasma Dynamics
- Astronomical Observations and Instrumentation
- Astronomical and nuclear sciences
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Isotope Analysis in Ecology
- Advanced Frequency and Time Standards
- Planetary Science and Exploration
- Scientific Research and Discoveries
- Geomagnetism and Paleomagnetism Studies
- Distributed and Parallel Computing Systems
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
University of Turin
2020-2024
Osservatorio Astrofisico di Torino
2021
Universidade do Porto
2017-2020
Institute of Astrophysics and Space Sciences
2017-2020
Trieste Astronomical Observatory
2016
University of Trieste
2016
We report on precise Doppler measurements of L231-32 (TOI-270), a nearby M dwarf ($d=22$ pc, $M_\star = 0.39$ M$_\odot$, $R_\star 0.38$ R$_\odot$), which hosts three transiting planets that were recently discovered using data from the Transiting Exoplanet Survey Satellite (TESS). The are 1.2, 2.4, and 2.1 times size Earth have orbital periods 3.4, 5.7, 11.4 days. obtained 29 high-resolution optical spectra with newly commissioned Echelle Spectrograph for Rocky Stable Spectroscopic...
Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable those of the coldest stars. These "ultra-hot Jupiters" have atmospheres made ions atomic species from molecular dissociation feature strong day-to-night temperature gradients. Photometric observations at different orbital phases provide insights on planet atmospheric properties. We analyse photometric WASP-189 acquired with instrument CHEOPS derive constraints system architecture...
We present the discovery and characterisation of two transiting planets observed by \textit{TESS} in light curves young bright (V=9.67) star HD73583 (TOI-560). perform an intensive spectroscopic photometric space- ground-based follow-up order to confirm characterise system. found that is a ($\sim 500$~Myr) active with rotational period $12.08 \pm 0.11 $\,d, mass radius $ 0.73 0.02 M_\odot$ $0.65 R_\odot$, respectively. b ($P_b=6.3980420 _{ - 0.0000062 }^{+0.0000067}$ d) has $10.2...
The system of two transiting Neptune-sized planets around the bright, young M-dwarf AU Mic provides a unique opportunity to test models planet formation, early evolution, and star-planet interaction. However, intense magnetic activity host star makes measuring masses via radial velocity (RV) method very challenging. We report on 1-year, intensive monitoring campaign using 91 observations with HARPS spectrograph, allowing for detailed modelling $\sim 600\, \rm{m\,s^{-1}}$ peak-to-peak...
Ultra-short-period (USP) exoplanets have orbital periods shorter than one day. Precise masses and radii of USPs could provide constraints on their unknown formation evolution processes. We report the detection characterization USP planet GJ 367b using high precision photometry radial velocity observations. orbits a bright (V-band magnitude = 10.2), nearby, red (M-type) dwarf star every 7.7 hours. has radius $0.718 \pm 0.054$ Earth-radii, mass $0.546 0.078$ Earth-masses, making it sub-Earth....
AU Mic is a young planetary system with resolved debris disc showing signs of planet formation and two transiting warm Neptunes near mean-motion resonances. Here we analyse three transits b observed the CHaracterising ExOPlanet Satellite (CHEOPS), supplemented sector 1 27 Transiting Exoplanet Survey (TESS) photometry, All-Sky Automated (ASAS) from ground. The refined orbital period 8.462995 \pm 0.000003 d, whereas stellar rotational P_{rot}=4.8367 0.0006 d. periods indicate 7:4 spin--orbit...
Context: TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting bright (G = 8.9 mag), young ($340\pm80$ Myr) K-type star. Although validated planetary system, the orbits two outer planets were unconstrained as only non-consecutive transits seen in TESS photometry. This left 11 and 7 possible period aliases for each. Aims: To reveal true these long-period planets, precise photometry targeted on highest-probability required. Long-term monitoring multi-planet systems can also...
Context. A large sample of long-period giant planets has been discovered thanks to long-term radial velocity surveys, but only a few dozen these have precise radius measurement. Transiting gas giants are crucial targets for the study atmospheric composition across wide range equilibrium temperatures and, more importantly, shedding light on formation and evolution planetary systems. Indeed, compared hot Jupiters, properties orbital parameters cooler unaltered by intense stellar irradiation...
We use a sample of 1669 QSOs ($r<20.15$, $3.6<z<4.0$) from the BOSS survey to study intrinsic shape their continuum and Lyman photon escape fraction (f$_{esc}$), estimated as ratio between observed flux expected (corrected for intergalactic medium absorption) in wavelength range 865-885 \AA\ rest-frame. Modelling QSO with power-law, $F_{\lambda}\propto\lambda^{-\gamma}$, we find median $\gamma=1.30$ (with dispersion $0.38$, no dependence on redshift mild luminosity dependence) mean...
We report the discovery and characterization of two transiting planets around bright M1 V star LP 961-53 (TOI-776, J = 8.5 mag, M 0.54+-0.03 Msun) detected during Sector 10 observations Transiting Exoplanet Survey Satellite (TESS). Combining TESS photometry with HARPS radial velocities, as well ground-based follow-up transit from MEarth LCOGT telescopes, we measured for inner planet, TOI-776 b, a period 8.25 d, radius 1.85+-0.13 Re, mass 4.0+-0.9 Me; outer c, 15.66 2.02+-0.14 5.3+-1.8 Me....
Abstract GJ 367 is a bright ( V ≈ 10.2) M1 star that has been recently found to host transiting ultra-short period sub-Earth on 7.7 hr orbit. With the aim of improving planetary mass and radius unveiling inner architecture system, we performed an intensive radial velocity follow-up campaign with HARPS spectrograph—collecting 371 high-precision measurements over baseline nearly 3 yr—and combined our Doppler new TESS observations from sectors 35 36. We b M = 0.633 ± 0.050 ⊕ R 0.699 0.024 ,...
The TOI-1130 is a known planetary system around K-dwarf consisting of gas giant planet, c, on an 8.4-day orbit, accompanied by inner Neptune-sized b, with orbital period 4.1 days. We collected precise radial velocity (RV) measurements the HARPS and PFS spectrographs as part our ongoing RV follow-up program. perform photodynamical modeling RVs, transit photometry from Transiting Exoplanet Survey Satellite (TESS) TESS Follow-up Observing Program. determine planet masses radii b c to be Mb =...
Context. M-dwarf stars are the most common of potential exoplanet host in Galaxy. It is therefore very important to understand planetary systems orbiting such and determine physical parameters planets with high precision. Also launch James Webb Space Telescope (JWST) observation atmospheric these has begun. required properties targets. Aims. Two around red dwarf TOI-776 were detected by TESS. The objective our study was use transit observations obtained CHEOPS space mission improve current...
Context . Multi-planet systems are important sources of information regarding the evolution planets. However, long-period planets in these often escape detection. These objects particular may retain more their primordial characteristics compared to close-in counterparts because increased distance from host star. HD 22946 is a bright ( G = 8.13 mag) late F-type star around which three transiting were identified via Transiting Exoplanet Survey Satellite (TESS) photometry, but true orbital...
ABSTRACT We present 17 transit light curves of seven known warm-Jupiters observed with the CHaracterising ExOPlanet Satellite (CHEOPS). The have been collected as part CHEOPS Guaranteed Time Observation (GTO) program that searches for transit-timing variation (TTV) induced by a possible external perturber to shed on evolution path such planetary systems. describe observation process, from planning data analysis. In this work, we focused timing performance CHEOPS, impact sampling phases, and...
Observations of the phase curves and secondary eclipses extrasolar planets provide a window on composition thermal structure planetary atmospheres. For example, photometric observations lead to measurement geometric albedo $A_g$, which is an indicator presence clouds in atmosphere. In this work we aim measure $A_g$ optical domain WASP-43b, moderately irradiated giant planet with equilibrium temperature $\sim$1400~K. To purpose, analyze eclipse light collected by CHEOPS, together TESS system...
Context. Tidal orbital decay is suspected to occur for hot Jupiters in particular, with the only observationally confirmed case of this being WASP-12b. By examining effect, information on properties host star can be obtained using so-called stellar modified tidal quality factor Q * ′ , which describes efficiency kinetic energy planet dissipated within star. This provide about interior Aims. In study, we aim improve constraints KELT-9, KELT-16, and WASP-4 systems order find evidence or...
Here we report large-amplitude transit timing variations (TTVs) for AU\,Microcopii b and c as detected in combined TESS (2018, 2020) CHEOPS (2020, 2021) observations. AU Mic is a young planetary system with debris disk two transiting warm Neptunes. A TTV on the order of several minutes was previously reported b, which suggested to be an outcome mutual perturbations between planets system. In 2021, observed (five transits) (three space telescope follow-up possibly detect c. When analyzing...
ABSTRACT We report the discovery of two warm sub-Neptunes transiting bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing small planets. The inner planet, b, detected with an unambiguous period but outer c, showed only transits separated ∼ 734 d, leading to 36 possible values its period. performed follow-up observations CHaracterising ExOPlanet (CHEOPS) confirm true c improve radius...
Transiting super-Earths orbiting bright stars in short orbital periods are interesting targets for the study of planetary atmospheres. While selecting suitable further characterization from ground among a list confirmed and validated exoplanets detected by K2, we found some suspicious cases that led to us re-assessing nature transiting signal. We did photometric analysis K2 light curves centroid motions barycenters. Our shows planets K2-78b, K2-82b, K2-92b actually not but background...
We report the discovery of a warm Neptune and hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), bright (V=9.9) G9 dwarf star in visual binary system observed by TESS space mission Sectors 5 6. performed ground-based follow-up observations -- comprised LCOGT transit photometry, NIRC2 adaptive optics imaging, FIES, CORALIE, HARPS, HIRES, PFS high-precision Doppler measurements confirmed planetary nature 16-day candidate announced team. discovered an additional radial velocity...
Abstract π Men hosts a transiting planet detected by the Transiting Exoplanet Survey Satellite space mission and an outer in 5.7 yr orbit discovered radial velocity (RV) surveys. We studied this system using new RV measurements taken with HARPS spectrograph on ESO’s 3.6 m telescope, as well archival data. constrain stellar semiamplitude due to planet, c, K c = 1.21 ± 0.12 s −1 , resulting mass of M 3.63 0.38 ⊕ . A radius R 2.145 0.015 yields bulk density ρ 2.03 0.22 g cm −3 The precisely...
ABSTRACT We report on the precise radial velocity follow-up of TOI-544 (HD 290498), a bright K star (V = 10.8), which hosts small transiting planet recently discovered by Transiting Exoplanet Survey Satellite (TESS). collected 122 high-resolution High Accuracy Radial Planet Searcher (HARPS) and HARPS-N spectra to spectroscopically confirm measure its mass. The nearly 3-yr baseline our allowed us unveil presence an additional, non-transiting, longer-period companion planet. derived radius...