Olga Suárez
A5047438723- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- History and Developments in Astronomy
- Astrophysics and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Radio Astronomy Observations and Technology
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Regional Economic and Spatial Analysis
- Historical and socio-economic studies of Spain and related regions
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Space Satellite Systems and Control
- Bat Biology and Ecology Studies
- Spacecraft and Cryogenic Technologies
- Superconducting Materials and Applications
Université Côte d'Azur
2012-2024
Centre National de la Recherche Scientifique
2013-2024
Observatoire de la Côte d’Azur
2013-2024
Lagrange Laboratory
2006-2023
Instituto de Astrofísica de Andalucía
2008-2011
Consejo Superior de Investigaciones Científicas
2008-2011
SKA Observatory
2011
Museum of the American Revolution
2009
Instituto de Física Fundamental
2005-2007
Instituto Nacional de Técnica Aeroespacial
2005
Abstract Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect find 5–15 R ⊕ planets around young stars even if their older counterparts harbor none. We report the discovery validation of TOI 1227b, a 0.85 ± 0.05 J (9.5 ) planet transiting very-low-mass star (0.170 0.015 M ⊙ every 27.4 days. 1227's kinematics strong lithium absorption confirm that it is member previously discovered subgroup in Lower Centaurus Crux OB association,...
Post-AGB stars are key objects for the study of dramatic morphological changes low- to intermediate-mass on their evolution from Asymptotic Giant Branch (AGB) towards Planetary Nebula stage. There is growing evidences that binary interaction processes may very well have a determining role in shaping process many objects, but so far direct evidence still weak. We aim at systematic dust distribution around large sample as probe symmetry breaking nebulae these systems. used imaging mid-infrared...
In this paper we report a new transiting warm giant planet: KOI-1257 b. It was first detected in photometry as planet-candidate by the ${\it Kepler}$ space telescope and then validated thanks to radial velocity follow-up with SOPHIE spectrograph. orbits its host star period of 86.647661 d $\pm$ 3 s high eccentricity 0.772 0.045. The planet transits main metal-rich, relatively old binary system stars mass 0.99 0.05 Msun 0.70 $ \pm 0.07 for primary secondary, respectively. This is constrained...
K2-19 is the second multi-planetary system discovered with K2 observations. The composed of two Neptune size planets close to 3:2 mean-motion resonance. To better characterise we obtained additional transit observations K2-19b and five radial velocity These were combined data fitted simultaneously dynamics (photo-dynamical model) which increases precision time measurements. higher allows us detect chopping signal dynamic interaction that in turn permits uniquely system. Although reflex...
TOI-2525 is a K-type star with an estimated mass of M = 0.849$_{-0.033}^{+0.024}$ M$_\odot$ and radius R 0.785$_{-0.007}^{+0.007}$ R$_\odot$ observed by the TESS mission in 22 sectors (within 1 39). The light curves yield significant transit events two companions, which show strong timing variations (TTVs) semi-amplitude $\sim$6 hours. We performed TTV dynamical, photo-dynamical curve analysis data, combined radial velocity (RV) measurements from FEROS PFS, we confirmed planetary nature...
ABSTRACT In the present paper we report discovery of a new hot Jupiter, K2-29 b, first detected by Super-WASP observatory and then K2 space mission during its campaign 4. The planet has period 3.25 days, mass 0.73 ± 0.04 M ♃ , radius 1.19 0.02 R . host star is relatively bright ( V = 12.5) G7 dwarf with nearby K5V companion. Based on stellar rotation abundance lithium, find that system might be as young ~450 Myr. observation Rossiter–McLaughlin effect shows aligned respect to spin. Given...
We present continuum and molecular line (CO, C$^{18}$O, HCO$^+$) observations carried out with the Atacama Large Millimeter/submillimeter Array toward "water fountain" star IRAS 15103-5754, an object that could be youngest PN known. detect two sources, separated by $0.39\pm 0.03$ arcsec. The emission from brighter source seems to arise mainly ionized gas, thus confirming nature of object. is dominated a circumstellar torus diameter $\simeq 0.6$ arcsec (2000 au) expanding at 23$ km s$^{-1}$....
Abstract AU Mic is a young (22 Myr), nearby exoplanetary system that exhibits excess transit timing variations (TTVs) cannot be accounted for by the two known transiting planets nor stellar activity. We present statistical “validation” of tentative planet d (even though there are examples “confirmed” with ambiguous orbital periods). add 18 new transits and nine midpoint times in an updated TTV analysis to prior work. perform joint modeling light curves using EXOFASTv2 extract times. Next, we...
Abstract We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by NASA Transiting Exoplanet Survey Satellite. transits G-type star ( V = 12.6 mag) with mass, radius, effective temperature <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>M</mml:mi> </mml:mrow> <mml:mo>⋆</mml:mo> </mml:msub> <mml:mo>=</mml:mo> <mml:mn>1.00</mml:mn> <mml:msubsup> <mml:mn>5</mml:mn>...
We present Cryoscope -- a new 50 sq. deg field-of-view, 1.2 m aperture, K-dark survey telescope to be located at Dome C, Antarctica. has an innovative optical-thermal design wherein the entire is cryogenically cooled. also explores detector technology cost-effectively tile full focal plane. Leveraging dark Antarctic sky and minimizing thermal emission, achieves unprecedented deep, wide, fast red observations, matching exceeding volumetric speeds from Ultraviolet Explorer, Vera Rubin...
We report the discovery of five transiting companions near hydrogen-burning mass limit in close orbits around main sequence stars originally identified by Transiting Exoplanet Survey Satellite (TESS) as TESS Objects Interest (TOIs): TOI-148, TOI-587, TOI-681, TOI-746, and TOI-1213. Using ground-based photometry well radial velocities from CORALIE, CHIRON, TRES, FEROS spectrographs, we found have orbital periods between 4.8 27.2 days, masses 77 98 $\mathrm{M_{Jup}}$, radii 0.81 1.66...
Abstract High-eccentricity tidal migration is a possible way for giant planets to be placed in short-period orbits. If this happens often, one would expect catch proto hot Jupiters on highly elliptical orbits undergoing high-eccentricity migration. As of yet, few such systems have been discovered. Here, we introduce TOI-3362b (TIC-464300749b), an 18.1 day, 5 M Jup planet orbiting main-sequence F-type star that likely The orbital eccentricity 0.815 <mml:math...
We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single transit events in light curves generated from full frame images Transiting Exoplanet Survey Satellite (TESS). Follow-up radial velocity measurements additional used to determine periods confirm planetary nature candidates. The planets orbit slightly metal-rich late F- early G-type stars. find that TOI 4406b has a mass $M_P$= 0.30 $\pm$...
Abstract We present the discovery and characterization of HIP 33609 b, a transiting warm brown dwarf orbiting late B star, discovered by NASA's Transiting Exoplanet Survey Satellite as TOI-588 b. b is large ( R = <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>1.580</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.070</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.074</mml:mn> </mml:msubsup> </mml:math> J ) on highly eccentric e...
Abstract The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon asteroid Didymos, changed Dimorphos’s orbit substantially, largely from ejection material. We present results 12 Earth-based facilities involved in a world-wide campaign to monitor brightness and morphology ejecta first 35 days after impact. After an initial brightening ∼1.4 mag, we find consistent dimming rates 0.11–0.12 mag day −1 week, 0.08–0.09 over entire study period. system returned its...
Abstract We present the spectroscopic confirmation and precise mass measurement of warm giant planet TOI-199 b. This was first identified in TESS photometry confirmed using ground-based from ASTEP Antarctica including a full 6.5 hr long transit, PEST, Hazelwood, LCO; space NEOSSat; radial velocities (RVs) FEROS, HARPS, CORALIE, CHIRON. Orbiting late G-type star, b has <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>104.854</mml:mn>...
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius 0.85 R j . It orbits low-mass pre-main sequence star (0.170 M ⊙ , 0.56 ) every 27.4 days. The magnetic activity young host induces radial velocity jitter and prevents good measurements planetary mass. We gathered additional transit observations space- ground-based telescopes, we detected highly significant transit-timing variations (TTVs). Their amplitude about 40 min their...
We present the discovery and characterization of two warm mini-Neptunes transiting K3V star TOI-815 in a K–M binary system. Analysis its spectra rotation period reveal to be young, with an age 200 −200 +400 Myr. TOI-8l5b has 11.2-day radius 2.94 ± 0.05 R ⊕ transits observed by TESS, CHEOPS, ASTEP, LCOGT. The outer planet, TOI-8l5c, 2.62 0.10 , based on observations three nonconsecutive TESS; targeted CHEOPS photometry radial velocity follow-up ESPRESSO were required confirm 35-day period....
Aims: Several studies suggest that the activity level of a planet-host star can be influenced by presence close-by orbiting planet. Moreover, interaction mechanisms have been proposed, magnetic and tidal interaction, exhibit very different dependence on orbital separation between A detection enhancement characterization its planetary distance can, in principle, allow us to characterize physical mechanism behind enhancement. Methods: We used HARPS-N spectrograph measure stellar HD 80606...
The detection and characterization of exoplanets brown dwarfs (BDs) around massive AF-type stars is essential to investigate constrain the impact stellar mass on planet properties. However, such targets are still poorly explored in radial velocity (RV) surveys because they only feature a small number lines those usually broadened blended by rotation as well jitter. As result, available information about formation evolution planets BDs hot limited. We aim increase sample precisely measure...
We report on the discovery and characterisation of three planets orbiting F8 star HD~28109, which sits comfortably in \tess's continuous viewing zone. The two outer have periods $\rm 56.0067 \pm 0.0003~days$ 84.2597_{-0.0008}^{+0.0010}~days$, implies a period ratio very close to that first-order 3:2 mean motion resonance, exciting transit timing variations (TTVs) up 60\,mins$. These were first identified by \tess, we third planet \textcolor{black}{\tess photometry} with 22.8911 0.0004~days$....
Abstract We report the discovery and characterization of three giant exoplanets orbiting solar-analog stars, detected by TESS space mission confirmed through ground-based photometry radial velocity measurements taken at La Silla observatory with FEROS. TOI-2373 b is a warm Jupiter its host star every ∼13.3 days, one most massive known exoplanet precisely determined mass radius around similar to Sun, an estimated m p = <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this work we present the results of a systematic search for diffuse bands (DBs, hereafter) in circumstellar envelopes carefully selected sample post-AGB stars. We concentrated on analyzing 9 DBs most commonly found interstellar medium. The strength these features is determined using high-resolution optical spectroscopy, and obtained are compared with literature data field stars affected only by reddening. Based weak observed subsample dominated reddening, conclude that carrier(s) must not...
Aims.We investigated the possible relationship between evolutionary stage of post-AGB stars and planetary nebulae (PNe) presence water masers in their envelopes
The most massive AGB stars are expected to result in heavily obscured post-AGB stars, proto-PNe and PNe with highly axisymmetric morphologies. To investigate this evolutionary connection, we have selected a sample of 165 presumably IRAS star PN candidates obtained near-IR JHK images for 164 them. These images, conjunction DSS, 2MASS, Spitzer GLIMPSE, MSX, AKARI, archival data, allowed us identify the counterparts 154 these sources, providing reliable finding charts coordinates. Near-IR...