David R. Rodriguez
A5100609862- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Isotope Analysis in Ecology
- Planetary Science and Exploration
- Nuclear Physics and Applications
- Space Exploration and Technology
- History and Developments in Astronomy
- High-pressure geophysics and materials
- Pulsars and Gravitational Waves Research
- Digital Transformation in Industry
- Atmospheric Ozone and Climate
- Space Science and Extraterrestrial Life
- Land Use and Ecosystem Services
- Molecular Spectroscopy and Structure
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astronomical and nuclear sciences
- Historical Astronomy and Related Studies
- Atomic and Molecular Physics
Scripps Research Institute
2025
Space Telescope Science Institute
2018-2024
Institut Catholique d'Arts et Métiers
2023-2024
Hospital Privado
2024
Centre d'Étude et de Recherche Travail Organisation Pouvoir
2023-2024
Asociación Demográfica Costarricense
2024
Universitat de València
2023
Instituto de Física Corpuscular
2023
Universitat Politècnica de València
2023
University of Chile
2004-2022
Abstract BANYAN Σ is a new Bayesian algorithm to identify members of young stellar associations within 150 pc the Sun. It includes 27 with ages in range ∼1–800 Myr, modeled multivariate Gaussians six-dimensional (6D) XYZUVW space. first such multi-association classification tool include nearest sub-groups Sco-Cen OB star-forming region, IC 2602, 2391, Pleiades and Platais 8 clusters, ρ Ophiuchi, Corona Australis, Taurus star formation regions. A model field stars built from mixture based on...
We present 2,241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its two-year prime mission. list these in TESS Objects of Interest (TOI) Catalog, which includes both new planet found by and previously-known planets recovered observations. describe process used to identify TOIs investigate characteristics candidates, discuss some notable discoveries. The TOI Catalog an unprecedented number small around nearby bright stars, are...
The majority of debris discs discovered so far have only been detected through infrared excess emission above stellar photospheres. While disc properties can be inferred from unresolved photometry alone under various assumptions for the physical dust grains, there is a degeneracy between radius and temperature that depends on grain size distribution optical properties. By resolving we measure actual location dust. launch Herschel, with an angular resolution superior to previous far-infrared...
We present basic observational data and association membership analysis for 45 young active low-mass stellar systems from the ongoing Research Consortium On Nearby Stars photometry astrometry program at Cerro Tololo Inter-American Observatory. Most of these have saturated X-ray emission (log (LX/Lbol) > −3.5) based on fluxes ROSAT All-Sky Survey, many are significantly more luminous than main-sequence stars comparable color. parallaxes proper motions, Johnson–Kron–Cousins VRI photometry,...
An increasing number of observations have shown that gaseous debris discs are not an exception. However, until now, we only knew cases around A stars. Here present the first detection 12CO (2–1) disc emission F star, HD 181327, obtained with Atacama Large Millimeter/submillimeter Array (ALMA) at 1.3 mm. The continuum and CO resolved into axisymmetric ring-like morphology. Using a Markov chain Monte Carlo method coupled radiative transfer calculations, study dust mass distribution. We find is...
The Herschel DEBRIS (Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre) survey brings us unique perspective on study of debris discs around main-sequence A-type stars. by design, offers remarkable data set with which to investigate cold disc properties. statistical analysis 100 and 160 μm for 86 A stars yields lower than previously found rate. Considering better 3σ excess sources, we find detection rate ≥24 ± 5 per cent at is similar F/G/K-spectral type While...
In healthcare and medical research, advisory boards are now commonplace, but most consist of a relatively homogenous, geographically collocated group, often demonstrating demographic imbalance. It is crucial to include individuals from diverse backgrounds on community for research address ongoing health disparities ensure studies more culturally competent so that we can achieve inclusive representation. We conducted purposeful recruitment attract demographically group members across the...
We present results from the earliest observations of DEBRIS, a <i>Herschel<i/> key programme to conduct volume- and flux-limited survey for debris discs in A-type through M-type stars. PACS images (from chop/nod or scan-mode observations) at 100 160 <i>μ<i/>m are presented toward two stars one F-type star: <i>β<i/> Leo, UMa <i>η<i/> Corvi. All three known disc hosts. spatially resolves dust emission around all (marginally, case UMa), providing new information about as close 11 pc with sizes...
We describe a method that exploits data from the GALEX ultraviolet and WISE 2MASS infrared source catalogs, combined with proper motions empirical pre-main sequence isochrones, to identify candidate nearby, young, low-mass stars.Applying our across full GALEXcovered sky, we 2031 mostly M-type stars that, for an assumed age of 10 (100) Myr, all lie within ∼150 (∼90) pc Earth.The distribution M spectral subclasses among these ∼2000 young peaks sharply in range M3-M4; subtypes constitute 50%...
The study of the planet-debris disk connection can shed light on formation and evolution planetary systems, may help predict presence planets around stars with certain characteristics. In preliminary analyses Herschel DEBRIS DUNES surveys, Wyatt et al. (2012) Marshall (2014) identified a tentative correlation between debris low-mass planets. Here we use cleanest possible sample out these surveys to assess such correlation, discarding without known ages, ages < 1 Gyr binary companions <100...
We have gathered a sample of 112 main-sequence stars with known debris disks. collected published information and performed adaptive optics observations at Lick Observatory to determine if these disks are associated binary or multiple stars. discovered previously unknown M-star companion HD 1051 projected separation 628 AU. found that 25% ± 4% our disk systems triple star systems, substantially less than the expected ∼50%. The period distribution for suggests relative lack 1–100 AU...
Debris disks have been found primarily around intermediate and solar mass stars (spectral types A-K) but rarely low M-type stars. We spatially resolved a debris disk the remarkable M3-type star GJ581 hosting multiple planets using deep PACS images at 70, 100 160 microns as part of DEBRIS Program on Herschel Space Observatory. This is second an star, after one surrounding young AU Mic (12 Myr). However, GJ 581 much older (2-8 Gyr), X-ray quiet in ROSAT data. fit axisymmetric model to three...
Circumstellar dust discs have been observed around many nearby stars. However, stars are part of binary or multiple stellar systems. A natural question arises regarding the presence and properties such in systems with more than one star. To address this, we consider a sample 449 (spectral types A–M) Herschel Space Observatory as DEBRIS (Disc Emission via Bias-free Reconnaissance Infrared/Submillimetre) programme. We examined multiplicity this by gathering information from literature...
We describe a new method to identify young, late-type stars within ~150 pc of the Earth that employs visual or near-infrared data and GALEX GR4/5 database. For spectral types later than K5, we demonstrate ratio near-ultraviolet (NUV) near-IR emission is larger for with ages between 10 100 Myr older, main sequence stars. A search in regions sky encompassing TW Hya Scorpius-Centaurus Associations has returned 54 high-quality candidates followup. Spectroscopic observations 24 these M1-M5...
We report the discovery of TOI-2180 b, a 2.8 $M_{\rm J}$ giant planet orbiting slightly evolved G5 host star. This transited only once in Cycle 2 primary Transiting Exoplanet Survey Satellite (TESS) mission. Citizen scientists identified 24 hr single-transit event shortly after data were released, allowing Doppler monitoring campaign with Automated Planet Finder telescope at Lick Observatory to begin promptly. The radial velocity observations refined orbital period b be 260.8$\pm$0.6 days,...
With increased interest in forest restoration comes an urgent need to provide accurate, scalable, and cost‐effective monitoring tools. The ubiquity of smartphones has led a surge apps. We reviewed assessed apps found through web searches conversations with practitioners. identified 42 that (1) automatically monitor indicators or (2) facilitate data entry. selected the five most promising from first category, based on their relevance, availability, stability, user support. compared them...
Aims. We carried out a continuous monitoring of comet 29P/Schwassmann-Wachmann 1 by using medium aperture telescopes with the aim studying activity and outburst mechanisms this on basis photometric variations.
We have conducted the first comprehensive millimeter-wave molecular emission line surveys of evolved circumstellar disks orbiting nearby, roughly solar-mass, pre-main-sequence (T Tauri) stars, TW Hya (D = 54 pc) and V4046 Sgr AB 73 pc). Both are known to retain significant residual gaseous components despite advanced ages their host stars (∼8 Myr ∼21 Myr, respectively). Our unbiased broadband radio spectral were performed with Atacama Pathfinder Experiment 12 m telescope, intended yield a...
Large sub-Neptunes are uncommon around the coolest stars in Galaxy and rarer still those that metal-poor. However, owing to large planet-to-star radius ratio, these planets highly suitable for atmospheric study via transmission spectroscopy infrared, such as with JWST. Here we report discovery validation of a sub-Neptune orbiting thick-disk, mid-M dwarf star TOI-2406. We first infer properties host by analysing star's near-infrared spectrum, spectral energy distribution, Gaia parallax. use...
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...
We report the discovery of TOI-530b, a transiting giant planet around an M0.5V dwarf, delivered by Transiting Exoplanet Survey Satellite (TESS). The host star is located at distance $147.7\pm0.6$ pc with radius $R_{\ast}=0.54\pm0.03\ R_{\odot}$ and mass $M_{\ast}=0.53\pm0.02\ M_{\odot}$. verify planetary nature transit signals combining ground-based multi-wavelength photometry, high resolution spectroscopy from SPIRou as well high-angular-resolution imaging. With $V=15.4$ mag, TOI-530b...
[Abridged] We exploit the extreme radial velocity (RV) precision of ultra-stable echelle spectrograph ESPRESSO on VLT to unveil physical properties transiting sub-Neptune TOI-130 b, uncovered by TESS orbiting nearby, bright, late F-type star HD 5278 (TOI-130) with a period $P_{\rm b}=14.3$. use 43 high-resolution spectra and broad-band photometry information derive accurate stellar atmospheric parameters 5278. light curve (LC) spectroscopic diagnostics gauge impact activity RVs. perform...
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} =...
TOI-1416 (BD+42 2504, HIP 70705) is a V =10 late G- or early K-type dwarf star. TESS detected transits in its Sectors 16, 23, and 50 with depth of about 455 ppm period 1.07 days. Radial velocities (RVs) confirm the presence transiting planet b , which has mass 3.48 ± 0.47 M ⊕ radius 1.62 0.08 R implying slightly sub-Earth density 4.50 −0.83 +0.99 g cm −3 . The RV data also further indicate tentative planet, c 27.4 29.5 days, whose nature cannot be verified due to strong suspicions...
Abstract We present the discovery of TOI 762 A b and TIC 46432937 b, two giant planets transiting M-dwarf stars. Transits both systems were first detected from observations by NASA TESS mission, objects are confirmed as through high-precision radial velocity carried out with Very Large Telescope/ESPRESSO. is a warm sub-Saturn mass 0.251 ± 0.042 M J , radius 0.744 0.017 R an orbital period 3.4717 days. It transits mid-M-dwarf star 0.442 0.025 ☉ 0.4250 0.0091 . The has resolved binary...