J. Rodrigues
A5004386622- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Science and Education Research
- Healthcare during COVID-19 Pandemic
- Health Education and Validation
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Scientific Research and Discoveries
- Non-Destructive Testing Techniques
- Context-Aware Activity Recognition Systems
- Welding Techniques and Residual Stresses
- Space Exploration and Technology
- Educational Games and Gamification
- Advanced Welding Techniques Analysis
- Knowledge Societies in the 21st Century
Universidade do Porto
2021-2025
Institute of Astrophysics and Space Sciences
2021-2025
Bagnoud Observatory
2023-2025
National Laboratory of Energy and Geology
2021
University of Geneva
2019-2020
University of Massachusetts Amherst
1996
GJ 9827 is a bright, nearby K7V star orbited by two super-Earths and one mini-Neptune on close-in orbits. The system was first discovered using K2 data then further characterized other spectroscopic photometric instruments. Previous literature studies provide several mass measurements for the three planets, however, with large variations uncertainties. To better constrain planetary masses, we added high-precision radial velocity from ESPRESSO to published datasets HARPS, HARPS-N, HIRES...
We report the characterisation of a multi-planetary system composed five exoplanets orbiting K-dwarf HD~23472 (TOI-174). In addition to two super-Earths that were previously confirmed, we confirm and characterise three Earth-size planets in using ESPRESSO radial velocity observations. The this compact have periods $P_d \sim 3.98\,$, $P_e 7.90\,$, $P_f 12.16\,$, $P_b 17.67,\,$ $P_c 29.80\,$days radii $R_d 0.75\,$ , $R_e 0.82,$, $R_f 1.13\,$, $R_b 2.01,\,$ and, $R_c 1.85\,$ \REarth. Because...
The number of super-Earth and mini-Neptune planet discoveries has increased significantly in the last two decades thanks to transit radial velocity (RV) surveys. When it is possible apply both techniques, we can characterise internal composition exoplanets, which turn provides unique insights on their architecture, formation evolution. We performed a combined photometric RV analysis TOI-238 (TYC 6398-132-1), one short-orbit candidate announced by NASA’s TESS team. aim confirm its planetary...
Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring different proposed explanations observed bimodality in distribution of close-in exoplanets. One such system is HIP 29442 (TOI-469), an evolved K0V star hosting two super-Earths and one sub-Neptune. We with CHEOPS a total 9.6 days, which we modelled jointly sectors TESS data to derive planetary radii 3.410 ± 0.046, 1.551 0.045, 1.538 0.049 R ⊕ planets b, c, d, orbit periods 13.6, 3.5, 6.4 respectively....
Since 2011, the SOPHIE spectrograph has been used to search for Neptunes and super-Earths in Northern Hemisphere. As part of this observational program, 290 radial velocity measurements 6.4 V magnitude star HD 158259 were obtained. Additionally, TESS photometric target are available. We present an analysis data compare our results with output pipeline. The data, ancillary spectroscopic indices, ground-based analyzed classical $\ell_1$ periodograms. stellar activity was modeled as a...
Abstract The recent discoveries of Neptune-sized ultra-short-period planets (USPs) challenge existing planet formation theories. It is unclear whether these residents the Hot Neptune Desert have similar origins to smaller, rocky USPs, or if this discrete population evidence a different pathway altogether. We report discovery TOI-3261b, an ultrahot with orbital period P = 0.88 day. host star V 13.2 mag, slightly supersolar metallicity ([Fe/H] ≃0.15), inactive K1.5 main-sequence at d 300 pc....
One of the goals ESPRESSO guaranteed time observations (GTOs) at ESO 8.2m telescope is to follow up on candidate planets from transit surveys such as TESS mission. High-precision radial velocities are required characterize small exoplanets. We intend confirm existence a transiting super-Earth around bright (V=9.74) K0-type star TOI-512 (TIC 119292328) and provide characterization. Combining photometric data 37 high-resolution spectroscopic in joint Markov chain Monte Carlo analysis, we...
One of the goals ESPRESSO guaranteed time observations (GTOs) at ESO 8.2m telescope is to follow up on candidate planets from transit surveys such as TESS mission. High-precision radial velocities are required characterize small exoplanets. Aims. We intend confirm existence a transiting super-Earth around bright (V=9.74) K0-type star TOI-512 (TIC 119292328) and provide characterization. Combining photometric data 37 high-resolution spectroscopic in joint Markov chain Monte Carlo analysis, we...
O estudo teve como objetivo investigar os impactos da educação em tempo integral nas políticas educacionais, práticas pedagógicas e na vida dos estudantes. problema central foi entender a ampliação carga horária escolar afeta o desempenho acadêmico, desenvolvimento pessoal social alunos, além de examinar desafios enfrentados implementação desse modelo no Brasil. A metodologia adotada uma revisão bibliográfica, qual foram analisados estudos, dissertações, teses artigos acadêmicos que...
Context. One of the goals Echelle Spectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) Guaranteed Time (GTO) consortium is precise characterisation a selected sample planetary systems discovered by TESS. such target K0V star HIP 29442 (TOI-469), already known to host validated sub-Neptune companion TOI-469.01, which we followed-up with ESPRESSO. Aims. We aim verify nature TOI-469.01 obtaining mass, radius, ephemeris, constraining its bulk physical structure...
Abstract In this paper, we present a homogeneous analysis of close-in Neptune planets. To do this, compile sample TESS-observed planets using ranking criterion which takes into account the planet’s period, radius, and visual magnitude its host star. We use archival new HARPS data to ensure every target in has precise radial velocities. This yields total 64 targets, 46 are confirmed 18 show no significant velocity signal. explore mass-radius distribution, planetary density, stellar...
We present radial velocity follow-up obtained with ESPRESSO of the M-type star LTT 1445A (TOI-455), for which a transiting planet b an orbital period of~5.4 days was detected by TESS. report discovery second (LTT c) and third non-transiting candidate d) periods 3.12 24.30 days, respectively. The host is main component triple M-dwarf system at distance 6.9 pc. used 84 high-resolution spectra to determine accurate masses 2.3$\pm$0.3 $\mathrm{M}_\oplus$ 1.0$\pm$0.2 planets c minimum mass...
Transiting planets with orbital periods longer than 40 d are extremely rare among the 5000+ discovered so far. The lack of discoveries this population poses a challenge to research into planetary demographics, formation, and evolution. Here, we present detection characterization HD 88986 b, potentially transiting sub-Neptune, possessing longest period known small (<4 R ⊕ ) precise mass measurement ( σ M /M > 25%). Additionally, identified presence massive companion in wider orbit...
Context. SMSS J160540.18−144323.1 is the carbon-enhanced metal-poor (CEMP) star with lowest iron abundance ever measured, [Fe/H] = −6.2, which was first reported SkyMapper telescope. The carbon A (C)≈6.1 in low-C band, as majority of stars this metallicity range. Yet, constraining isotopic ratio key species, such carbon, sheds light on properties and origin these elusive stars. Aims. We performed high-resolution observations 1605−1443 ESPRESSO spectrograph to look for variations radial...
ABSTRACT We report the discovery of two exoplanets orbiting around HD 212729 (TOI 1052, TIC 317060587), a Teff = 6146 K star with V 9.51 observed by TESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass transits star, an additional planet TOI-1052c radial velocities but not seen to transit. confirm planetary nature TOI-1052b using precise velocity observations from HARPS determined its parameters joint RV photometry analysis. has radius $2.87^{+0.29}_{-0.24}$ R⊕, mass 16.9 ±...
GJ 9827 is a bright, nearby K7V star orbited by two super-Earths and one mini-Neptune on close-in orbits. The system was first discovered using K2 data then further characterized other spectroscopic photometric instruments. Previous literature studies provide several mass measurements for the three planets, however, with large variations uncertainties. To better constrain planetary masses, we added high-precision radial velocity from ESPRESSO to published datasets HARPS, HARPS-N, HIRES...
Since 2018, the ESPRESSO spectrograph at VLT has been hunting for planets in Southern skies via RV method. One of its goals is to follow up candidate from transit surveys such as TESS mission, particularly small planets. We analyzed photometry and ground-based facilities, high-resolution imaging, RVs ESPRESSO, HARPS, HIRES, confirm characterize three new planets: TOI-260 b, transiting a late K-dwarf, TOI-286 b c, orbiting an early K-dwarf. also update parameters known super-Earth TOI-134 ,...
ABSTRACT We present the discovery of an exoplanet transiting TOI-908 (TIC-350153977) using data from TESS sectors 1, 12, 13, 27, 28, and 39. is a T = 10.7 mag G-dwarf (Teff 5626 ± 61 K) solar-like star with mass 0.950 0.010 M⊙ radius 1.028 0.030 R⊙. The planet, b, 3.18 0.16 R⊕ planet in d orbit. Radial velocity measurements HARPS reveal b has approximately 16.1 4.1 M⊕, resulting bulk planetary density $2.7^{+0.2}_{-0.4}$ g cm−3. lies sparsely populated region parameter space known as Neptune...
The number of super-Earth and mini-Neptune planet discoveries has increased significantly in the last two decades thanks to transit radial velocity surveys. When it is possible apply both techniques, we can characterise internal composition exoplanets, which turn provides unique insights on their architecture, formation evolution. We performed a combined photometric analysis TOI-238 (TYC 6398-132-1), one short-orbit candidate announced by NASA's TESS team. aim confirm its planetary nature...
Context . Since 2018, the ESPRESSO spectrograph at VLT has been hunting for planets in southern skies via radial velocity (RV) method. One of its goals is to follow up on candidate from transit surveys such as TESS mission, with a particular focus small which ESPRESSO’s RV precision vital. Aims We aim confirm and characterise, detail, three super-Earth transiting using precise RVs ESPRESSO. Methods analysed photometry ground-based facilities, high-resolution imaging, ESPRESSO, HARPS, HIRES,...
Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring proposed explanations observed bimodality in distribution of close-in exoplanets. One such system is HIP 29442 (TOI-469), an evolved K0V star hosting two super-Earths and a sub-Neptune. We observe with CHEOPS total 9.6 days, which we model jointly 2 sectors TESS data to derive planetary radii $3.410\pm0.046$, $1.551\pm0.045$ $1.538\pm0.049$ R$_\oplus$ planets b, c d, orbit periods 13.6, 3.5 6.4 days....
Devido ao avanço de novas tecnologias, houveram diversos aprimoramentos na área da educação por causa do surgimento ferramentas. Uma das mais utilizadas atualmente são as Inteligências Artificiais Conversacionais, que permitem o usuário faça perguntas e troque informações com a ferramenta. Portanto, é necessário entender como uso destas ferramentas pode auxiliar crianças, visando seus impactos, limitações necessidades. Além disso, garantir papel humano não seja substituído pela nova...