M. de Val-Borro
A5021162139- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- Calibration and Measurement Techniques
- Space Exploration and Technology
- Adaptive optics and wavefront sensing
- Chemical Thermodynamics and Molecular Structure
- Spectroscopy and Laser Applications
- Scientific Research and Discoveries
- Chemistry and Stereochemistry Studies
- Nuclear Physics and Applications
- Solar and Space Plasma Dynamics
- Spacecraft and Cryogenic Technologies
- Advanced Data Storage Technologies
- Adsorption, diffusion, and thermodynamic properties of materials
- Computational Physics and Python Applications
- Scientific Computing and Data Management
- Distributed and Parallel Computing Systems
- Space exploration and regulation
Planetary Science Institute
2019-2024
Goddard Space Flight Center
2016-2023
University of America
2017-2022
Catholic University of America
2017-2022
Catalyst
2022
Princeton University
2013-2019
Villanova University
2019
Max Planck Institute for Solar System Research
2010-2015
Max Planck Society
2010-2015
Princeton Public Schools
2015
(Abridged) We describe here the most ambitious survey currently planned in optical, Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a single wide-deep-fast sky survey, and LSST have unique capability faint time domain. The design is driven four main themes: probing dark energy matter, taking an inventory Solar System, exploring transient optical sky, mapping Milky Way. wide-field ground-based system sited at Cerro Pach\'{o}n northern Chile. telescope 8.4 m...
Abstract The Astropy Project supports and fosters the development of open-source openly developed Python packages that provide commonly needed functionality to astronomical community. A key element is core package astropy , which serves as foundation for more specialized projects packages. In this article, we an overview organization project summarize features in package, recent major release, version 2.0. We then describe infrastructure designed facilitate support a broader ecosystem...
astroquery is a collection of tools for requesting data from databases hosted on remote servers with interfaces exposed the internet, including those web pages but without formal application program interfaces. These are built Python requests package, which used to make HTTP requests, and astropy, provides most parsing functionality. modules generally attempt replicate page interface provided by given service as closely possible, making transition browser-based command-line interaction easy....
A key legacy of the recently launched TESS mission will be to provide astronomical community with many best transiting exoplanet targets for atmospheric characterization. However, time is essence take full advantage this opportunity. JWST, although delayed, still complete its nominal five year on a timeline that motivates rapid identification, confirmation, and mass measurement top characterization from TESS. Beyond future dedicated missions studies such as ARIEL require discovery...
We perform numerical simulations of a disc–planet system using various grid-based and smoothed particle hydrodynamics (SPH) codes. The tests are run for simple setup where Jupiter Neptune mass planets on circular orbit open gap in protoplanetary disc during few hundred orbital periods. compare the surface density contours, potential vorticity radial profiles at several times. gravitational torque time evolution analysed with high temporal resolution. There is overall consistency between...
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking formation evolution exoplanetary systems. Access to an exoplanet's chemical inventory requires high-precision observations, often inferred from individual molecular detections with low-resolution space-based high-resolution ground-based facilities. Here we report medium-resolution (R$\sim$600) transmission spectrum atmosphere between 3-5 $\mu$m covering multiple absorption...
Abstract Carbon dioxide (CO 2 ) is a key chemical species that found in wide range of planetary atmospheres. In the context exoplanets, CO an indicator metal enrichment (that is, elements heavier than helium, also called ‘metallicity’) 1–3 , and thus formation processes primary atmospheres hot gas giants 4–6 . It one most promising to detect secondary terrestrial exoplanets 7–9 Previous photometric measurements transiting planets with Spitzer Space Telescope have given hints presence but not...
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability. However, no unambiguous photochemical products have been detected in exoplanet to date. Recent observations from JWST Transiting Exoplanet Early Release Science Program found spectral absorption feature at 4.05 $\mu$m arising SO$_2$ atmosphere WASP-39b. WASP-39b 1.27-Jupiter-radii, Saturn-mass (0.28 M$_J$) gas giant orbiting Sun-like star with an equilibrium temperature...
Abstract Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining dominant chemical processes at work and, if equilibrium, revealing planet formation histories. Transmission spectroscopy (for example, refs. 1,2 ) provides necessary means by abundances of oxygen- carbon-bearing species; however, this requires broad wavelength coverage, moderate spectral resolution high precision, which, together, are not achievable with...
The D/H ratio in cometary water is believed to be an important indicator of the conditions under which icy planetesimals formed and can provide clues contribution comets delivery other volatiles Earth. Available measurements suggest that there isotopic diversity comet population. Herschel Space Observatory revealed ocean-like Jupiter-family 103P/Hartley 2, whereas most values measured Oort-cloud are twice as high ocean ratio. We present here a new measurement comet. HDO, H2O, lines were...
The James Webb Space Telescope (JWST) presents the opportunity to transform our understanding of planets and origins life by revealing atmospheric compositions, structures, dynamics transiting exoplanets in unprecedented detail. However, high-precision, timeseries observations required for such investigations have unique technical challenges, prior experience with Hubble, Spitzer, other facilities indicates that there will be a steep learning curve when JWST becomes operational. In this...
The Large Synoptic Survey Telescope is designed to provide an unprecedented optical imaging dataset that will support investigations of our Solar System, Galaxy and Universe, across half the sky over ten years repeated observation. However, exactly how LSST observations be taken (the observing strategy or "cadence") not yet finalized. In this dynamically-evolving community white paper, we explore detailed performance anticipated science expected depend on small changes strategy. Using...
Wide field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between properties and their parent stars. We report discovery HAT-P-69b (TOI 625.01) HAT-P-70b 624.01), two new hot Jupiters around A stars from HATNet survey which have also been observed by Transiting Exoplanet Survey Satellite (TESS). has mass 3.58 +0.58/-0.58 MJup radius 1.676 +0.051/-0.033 RJup, residing in prograde 4.79-day orbit. 1.87...
niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français étrangers, laboratoires publics privés.
pyspeckit is a toolkit and library for spectroscopic analysis in Python. We describe the package highlight some of its capabilities, such as interactively fitting model to data, akin historically widely-used splot function IRAF. employs Levenberg-Marquardt optimization method via mpfit lmfit implementations, important assumptions regarding error estimation are described here. Wrappers use pymc emcee optimizers provided. A parallelized wrapper fit lines spectral cubes included. As part...
Abstract The relative rarity of giant planets around low-mass stars compared with solar-type is a key prediction from the core-accretion planet formation theory. In this paper we report on discovery four gas that transit late K and early M dwarfs. HATS-74Ab (TOI 737b), HATS-75b 552b), HATS-76b 555b), HATS-77b 730b) were all discovered HATSouth photometric survey follow-up using TESS other facilities. We use new ESPRESSO facility at VLT to confirm systems measure their masses. find these have...
Observing exoplanets through transmission spectroscopy supplies detailed information on their atmospheric composition, physics, and chemistry. Prior to JWST, these observations were limited a narrow wavelength range across the near-ultraviolet near-infrared, alongside broadband photometry at longer wavelengths. To understand more complex properties of exoplanet atmospheres, improved coverage resolution are necessary robustly quantify influence broader absorbing molecular species. Here we...
Context.Vortices in protoplanetary disks can capture solid particles and form planetary cores within shorter timescales than those involved the standard core-accretion model.
We report the discovery by HATSouth survey of HATS-4b, an extrasolar planet transiting a V = 13.46 mag G star. HATS-4b has period P ≈ 2.5167 days, mass Mp 1.32 MJup, radius Rp 1.02 RJup, and density ρp 1.55 ± 0.16 g cm−3 ≈1.24 ρJup. The host star 1.00 M☉, 0.92 R☉, very high metallicity [Fe/H]=0.43 0.08. is among densest known planets with masses between 1 2 MJ thus likely to have significant content heavy elements order 75 M⊕. In this paper we present data reduction, radial velocity...
We report the discovery of HATS-17b, first transiting warm Jupiter HATSouth network. HATS-17b transits its bright (V=12.4) G-type (M$_{\star}$=1.131 $\pm$ 0.030 M$_{\odot}$, R$_{\star}$=1.091$^{+0.070}_{-0.046}$ R$_{\star}$) metal-rich ([Fe/H]=+0.3 dex) host star in a circular orbit with period P=16.2546 days. has very compact radius 0.777 0.056 R$_J$ given Jupiter-like mass 1.338 0.065 M$_J$. Up to 50% may be composed heavy elements order explain high density current models planetary...
emcee is a Python library implementing class of affine-invariant ensemble samplers for Markov chain Monte Carlo (MCMC). This package has been widely applied to probabilistic modeling problems in astrophysics where it was originally published, with some applications other fields. When first released 2012, the interface implemented fundamentally different from MCMC libraries that were popular at time, such as PyMC, because specifically designed work "black box" models instead structured...
We report on an initial analysis of Herschel/HIFI observations hydrogen chloride (HCl), peroxide (H_2O_2), and molecular oxygen (O_2) in the Martian atmosphere performed 13 16 April 2010 (L_s ~ 77{\deg}). derived a constant volume mixing ratio 1400 +/- 120 ppm for O_2 determined upper limits 200 ppt HCl 2 ppb H_2O_2. Radiative transfer model calculations indicate that vertical profile may not be constant. Photochemical models determine lowest values H_2O_2 to around L_s 75{\deg} but...