J. P. Faria
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View article: Stellar-activity analysis of the nearby M dwarf GJ 526
Stellar-activity analysis of the nearby M dwarf GJ 526 Open
M dwarfs are the most abundant stars in the Galaxy, and their low masses make them natural favourites for exoplanet radial-velocity (RV) searches. Nevertheless, these stars often demonstrate strong stellar activity that is yet to be fully …
View article: SOAPv4: A new step toward modeling stellar signatures in exoplanet research
SOAPv4: A new step toward modeling stellar signatures in exoplanet research Open
Context. In the era of high-resolution spectroscopy, methods for characterizing exoplanets and their atmospheres are advancing rapidly. As these techniques are refined and allow for the detection of even the most minute signals from the pl…
View article: NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant
NIRPS and TESS reveal a peculiar system around the M dwarf TOI-756: A transiting sub-Neptune and a cold eccentric giant Open
Context . The Near InfraRed Planet Searcher (NIRPS) joined HARPS on the 3.6-m ESO telescope at La Silla Observatory in April 2023, dedicating part of its Guaranteed Time Observations (GTO) program to the radial velocity follow-up of TESS p…
View article: Architecture of planetary systems with and without outer giant planets
Architecture of planetary systems with and without outer giant planets Open
Understanding the link between outer giant planets (OGPs) and inner light planets (ILPs) is key to understanding planetary system formation and architecture. The correlation between these two populations of planets is debated both theoreti…
View article: Detection and characterisation of a 106-day transiting Jupiter : TOI-2449 b / NGTS-36 b
Detection and characterisation of a 106-day transiting Jupiter : TOI-2449 b / NGTS-36 b Open
Only a handful of transiting giant exoplanets with orbital periods longer than 100 days are known. These warm exoplanets are valuable objects as their radius and mass can be measured leading to an in-depth characterisation of the planet's …
View article: Three hot Jupiters transiting K-dwarfs with significant heavy element masses
Three hot Jupiters transiting K-dwarfs with significant heavy element masses Open
Context . Despite predictions from planetary population synthesis models indicating that such systems should be exceedingly rare, short-period gas giants do exist around low-mass stars ( T eff < 4965 K), albeit at lower frequency than arou…
View article: A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level
A comprehensive study on radial velocity signals using ESPRESSO: Pushing precision to the 10 cm/s level Open
Aims . We analyse ESPRESSO data for the stars HD 10700 ( τ Ceti), HD 20794 ( e Eridani), HD 102365, and HD 304636 acquired via its Guaranteed Time Observations (GTO) programme. We characterise the stars’ radial velocity (RV) signals down t…
View article: Diving into the planetary system of Proxima with NIRPS
Diving into the planetary system of Proxima with NIRPS Open
We obtained 420 high-resolution spectra of Proxima, over 159 nights, using the Near Infra Red Planet Searcher (NIRPS). We derived 149 nightly binned radial velocity measurements with a standard deviation of 1.69 ms −1 and a median uncertai…
View article: An Indoor Navigation Solution for Visually Impaired People
An Indoor Navigation Solution for Visually Impaired People Open
This article describes the development of a mobile application designed to assist the navigation of visually impaired individuals in indoor environments. The application interacts with Bluetooth devices called beacons, which help identify …
View article: BEBOP VII. SOPHIE discovery of BEBOP-3b, a circumbinary giant planet on an eccentric orbit
BEBOP VII. SOPHIE discovery of BEBOP-3b, a circumbinary giant planet on an eccentric orbit Open
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 a new planet discovered during the BEBOP survey for circum…
View article: A systematic bias in template-based radial velocity extraction algorithms
A systematic bias in template-based radial velocity extraction algorithms Open
Context . The radial velocity (RV) method plays a key role in modern-day astrophysics. One of the most common techniques for extracting precise RVs from state-of-the-art spectrographs is template-matching (TM) algorithms. They have been sh…
View article: RV-exoplanet eccentricities: Good, Beta, and Best
RV-exoplanet eccentricities: Good, Beta, and Best Open
We examine the eccentricity distribution(s) of radial velocity (RV) detected exoplanets. Previously, the eccentricity distribution was found to be described well by a Beta distribution with shape parameters $a=0.867\,\mathrm{ and}\, b=3.03…
View article: RV-exoplanet eccentricities: Good, Beta, and Best
RV-exoplanet eccentricities: Good, Beta, and Best Open
We examine the eccentricity distribution(s) of radial velocity detected exoplanets. Previously, the eccentricity distribution was found to be described well by a Beta distribution with shape parameters $a=0.867, b=3.03$. Increasing the sam…
View article: TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO
TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO Open
Context. One of the goals of the ESPRESSO guaranteed time observations (GTOs) at the ESO 8.2 m telescope is to follow up on candidate planets from transit surveys such as the TESS mission. High-precision radial velocities are required to c…
View article: TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO
TOI-512: Super-Earth transiting a K-type star discovered by TESS and ESPRESSO Open
One of the goals of the ESPRESSO guaranteed time observations (GTOs) at the ESO 8.2m telescope is to follow up on candidate planets from transit surveys such as the TESS mission. High-precision radial velocities are required to characteriz…
View article: KOBE-1: The first planetary system from the KOBE survey
KOBE-1: The first planetary system from the KOBE survey Open
Context . K-dwarf stars are promising targets in the exploration of potentially habitable planets. Their properties, falling between G and M dwarfs, provide an optimal trade-off between the prospect of habitability and ease of detection. T…
View article: PoET: the Paranal solar ESPRESSO Telescope
PoET: the Paranal solar ESPRESSO Telescope Open
The detection and characterisation of other ‘Earths’, orbiting other suns, is a bold objective of present-day astrophysics. However, this quest is severely challenged by astrophysical ‘noise’ from the host stars, whose signatures distort t…
View article: Revisiting the multi-planetary system of the nearby star HD 20794
Revisiting the multi-planetary system of the nearby star HD 20794 Open
Context. Close-by Earth analogs and super-Earths are of primary importance because they will be preferential targets for the next generation of direct imaging instruments. Bright and close-by G-to-M type stars are preferential targets in r…
View article: A sub-Earth-mass planet orbiting Barnard’s star
A sub-Earth-mass planet orbiting Barnard’s star Open
Context. ESPRESSO guaranteed time observations (GTOs) at the 8.2m VLT telescope were performed to look for Earth-like exoplanets in the habitable zone of nearby stars. Barnard’s star is a primary target within the ESPRESSO GTO as it is the…
View article: The 𝒯ℛ𝒪𝒴 project
The 𝒯ℛ𝒪𝒴 project Open
Context. Co-orbital objects, also known as trojans, are frequently found in simulations of planetary system formation. In these configurations, a planet shares its orbit with other massive bodies. It is still unclear why there have not bee…
View article: ANDES, the high resolution spectrograph for the ELT: science goals, project overview and future developments
ANDES, the high resolution spectrograph for the ELT: science goals, project overview and future developments Open
The first generation of ELT instruments includes an optical-infrared high-resolution spectrograph, indicated as ELT-HIRES and recently christened ANDES (ArmazoNes high Dispersion Echelle Spectrograph). ANDES consists of three fibre-fed spe…
View article: ANDES, the high resolution spectrograph for the ELT: science goals, project overview, and future developments
ANDES, the high resolution spectrograph for the ELT: science goals, project overview, and future developments Open
The first generation of ELT instruments includes an optical-infrared\nhigh-resolution spectrograph, indicated as ELT-HIRES and recently christened\nANDES (ArmazoNes high Dispersion Echelle Spectrograph). ANDES consists of three\nfibre-fed …
View article: The TROY project III. Exploring co-orbitals around low-mass stars
The TROY project III. Exploring co-orbitals around low-mass stars Open
Co-orbital objects, also known as trojans, are frequently found in simulations of planetary system formation. In these configurations, a planet shares its orbit with other massive bodies. It is still unclear why there have not been any co-…
View article: Resonant sub-Neptunes are puffier
Resonant sub-Neptunes are puffier Open
A systematic, population-level discrepancy exists between the densities of exoplanets whose masses have been measured with transit timing variations (TTVs) versus those measured with radial velocities (RVs). Since the TTV planets are predo…
View article: NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths
NIRPS first light and early science: breaking the 1 m/s RV precision barrier at infrared wavelengths Open
The Near-InfraRed Planet Searcher or NIRPS is a precision radial velocity spectrograph developed through collaborative efforts among laboratories in Switzerland, Canada, Brazil, France, Portugal and Spain. NIRPS extends to the 0.98-1.8 $μ$…
View article: NGTS-30b/TOI-4862b: An ~1 Gyr old 98-day transiting warm Jupiter
NGTS-30b/TOI-4862b: An ~1 Gyr old 98-day transiting warm Jupiter Open
Context . Long-period transiting exoplanets bridge the gap between the bulk of transit- and Doppler-based exoplanet discoveries, providing key insights into the formation and evolution of planetary systems. The wider separation between the…
View article: NGTS-30 b/TOI-4862 b: An 1 Gyr old 98-day transiting warm Jupiter
NGTS-30 b/TOI-4862 b: An 1 Gyr old 98-day transiting warm Jupiter Open
Long-period transiting exoplanets bridge the gap between the bulk of transit- and Doppler-based exoplanet discoveries, providing key insights into the formation and evolution of planetary systems. The wider separation between these planets…
View article: Expanding the frontiers of cool-dwarf asteroseismology with ESPRESSO
Expanding the frontiers of cool-dwarf asteroseismology with ESPRESSO Open
Fuelled by space photometry, asteroseismology is vastly benefitting the study of cool main-sequence stars, which exhibit convection-driven solar-like oscillations. Even so, the tiny oscillation amplitudes in K dwarfs continue to pose a cha…
View article: Probing the small-scale structure of the intergalactic medium with ESPRESSO: spectroscopy of the lensed QSO UM673
Probing the small-scale structure of the intergalactic medium with ESPRESSO: spectroscopy of the lensed QSO UM673 Open
The gravitationally lensed quasar J014516.6-094517 at z = 2.719 has been observed with the ESPRESSO instrument at the ESO VLT to obtain high-fidelity spectra of the two images A and B with a resolving power R = 70 000. At the redshifts und…