P. Santos-Sanz
A5035999684- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Planetary Science and Exploration
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Astronomical Observations and Instrumentation
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Solar and Space Plasma Dynamics
- Meteorological Phenomena and Simulations
- Climate variability and models
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Oceanographic and Atmospheric Processes
- Geological and Geochemical Analysis
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Calibration and Measurement Techniques
- Astrophysics and Cosmic Phenomena
- Ocean Waves and Remote Sensing
Instituto de Astrofísica de Andalucía
2016-2025
Consejo Superior de Investigaciones Científicas
1997-2024
National Oceanic and Atmospheric Administration
2006-2018
Laboratoire d’études spatiales et d’instrumentation en astrophysique
2008-2014
Observatoire de Paris
2010-2014
Université de Versailles Saint-Quentin-en-Yvelines
2010-2014
Sorbonne Université
2010-2014
Université Paris Cité
2010-2014
Centre National de la Recherche Scientifique
2010-2014
Délégation Paris 7
2011-2014
Abstract The physical and orbital parameters of trans-Neptunian objects provide valuable information about the solar system’s formation evolution. In particular, characterization binaries provides insights into mechanisms that may be playing a role at such large distances from Sun. Studies show two distinct populations, (38628) Huya occupies an intermediate position between unequal-sized those with components roughly equal sizes. this work, we predicted observed three stellar occultation...
<i>Context. <i/>The goal of the <i>Herschel<i/> open time programme "<i>TNOs are Cool!<i/>" is to derive physical and thermal properties for a large sample Centaurs, trans-Neptunian objects (TNOs), including resonant, classical, detached scattered disk objects.<i>Aims. <i/>Based on observations two targets we tried (i) optimise SPIRE observing technique faint (close background confusion noise), slowly moving targets; (ii) test different model techniques; (iii) determine radiometric diameter...
Transneptunian objects (TNOs) are bodies populating the Kuiper Belt and they believed to retain most pristine least altered material of solar system. The Herschel Open Time Key Program entitled "TNOs Cool: A survey trans-Neptunian region" has been awarded 373 h investigate albedo, size distribution thermal properties TNOs Centaurs. Here we focus on brightest targets observed by both PACS SPIRE multiband photometers: dwarf planet Haumea, six (Huya, Orcus, Quaoar, Salacia, 2002 UX25, TC302),...
We analyze albedo data obtained using the Herschel Space Observatory that reveal existence of two distinct types surface among midsized trans-Neptunian objects. A color–albedo diagram shows large clusters objects, one redder and higher another darker more neutrally colored. Crucially, all objects in our sample located dynamically stable orbits within classical Kuiper Belt region beyond are confined to bright red group, implying a compositional link. Those believed have formed further from...
Quaoar is a classical Trans-Neptunian Object (TNO) with an area equivalent diameter of 1,100 km and orbital semi-major axis 43.3 astronomical units. Based on stellar occultations observed between 2018 2021, inhomogeneous ring (Q1R, Quaoar's first ring) was detected around this body. Aims. A new occultation by August 9th, 2022 aiming to improve shape models the physical parameters Q1R while searching for additional material Methods. The provided nine effective chords across Quaoar, pinning...
We propose that several short duration events observed in past stellar occultations by Chiron were produced rings material. From a reanalysis of the occultation data literature we determined two possible orientations pole Chiron's rings, with ecliptic coordinates l=(352+/-10) deg, b=(37+/-10) deg or l=(144+/-10) b=(24+/-10) . The mean radius is (324 +/- 10) km. One can use rotational lightcurve amplitude at different epochs to distinguish between solutions for pole. Both imply lower 2013...
We were able to accurately predict the shadow path and successfully observe an occultation of a bright star by Chiron on December 15, 2022. The Kottamia Astronomical Observatory in Egypt did not detect solid body, but we found three extinction features light curve that had symmetrical counterparts with respect central time occultation. One is broad shallow, whereas other two are sharper, maximum ∼25% at achieved spatial resolution 19 km per data point. From Wise Israel, detected caused main...
We present results of 6 years observations, reduced and analyzed with the same tools in a systematic way. report completely new data for 15 objects, 5 objects we analysis previously published plus additional 9 already published. Lightcurves, possible rotation periods photometric amplitudes are reported all them. The variability is smaller than thought: mean amplitude our sample 0.1mag only around 15% has larger 0.15mag. thought seems to be bias previous observations. find very weak trend...
Over one thousand objects have so far been discovered orbiting beyond Neptune. These trans-Neptunian (TNOs) represent the primitive remnants of planetesimal disk from which planets formed and are perhaps analogous to unseen dust parent-bodies in debris disks observed around other main-sequence stars. The dynamical physical properties these bodies provide unique important constraints on formation evolution models Solar System. While architecture this region (also known as Kuiper Belt) is...
We present Herschel PACS photometry of 18 Plutinos and determine sizes albedos for these objects using thermal modeling. analyze our results correlations, draw conclusions on the Plutino size distribution, compare to earlier results. Flux densities are derived from mini scan-maps specialized data reduction methods. In order improve quality results, we combine with existing Spitzer MIPS where possible, refine absolute magnitudes targets. The physical characterization sample is done a model....
Centaurs are the transitional population between trans-Neptunian objects (TNOs) and Jupiter-family comets. For this reason it is possible to access smaller ones, which more difficult do with TNO population. The goal of work characterize a set 16 in terms their size, albedo, thermal properties. We study correlations, for extended sample obtained from literature, diameter, orbital parameters, spectral slopes. performed three-band photometric observations using Herschel-PACS used consistent...
Two narrow and dense rings (called C1R C2R) were discovered around the Centaur object (10199) Chariklo during a stellar occultation observed on 2013 June 3. Following this discovery, we planned observations of several occultations by Chariklo's system in order to better characterize physical properties ring main body. Here, use 12 successful occulations between 2014 2016. They provide profiles (physical width, opacity, edge structure) constraints radii pole position. Our new are currently...
Abstract The National Hurricane Center Probability Program, which estimated the probability of a tropical cyclone passing within specific distance selected set coastal stations, was replaced by more general Tropical Cyclone Surface Wind Speed Probabilities in 2006. A Monte Carlo (MC) method is used to estimate probabilities 34-, 50-, and 64-kt (1 kt = 0.51 m s−1) winds at multiple time periods through 120 h. Versions MC model are available for Atlantic, combined eastern central North...
Abstract We present mid-infrared (MIR) spectral-timing measurements of the prototypical Galactic microquasar GRS 1915+105. The source was observed with Mid-Infrared Instrument (MIRI) onboard JWST in June 2023 at a MIR luminosity LMIR ≈ 1036 erg s−1 exceeding past IR levels by about factor 10. In contrast, X-ray flux is much fainter than historical average, source’s now–persistent ‘obscured’ state. MIRI low-resolution spectrum shows plethora emission lines, strongest which are consistent...
<i>Aims. <i/>We compile and analyze an extended database of light curve parameters scattered in the literature to search for correlations study physical properties, including internal structure constraints.<i>Methods. a vast by obtaining mean rotational properties entire sample, determining spin frequency distribution comparing those data with simple model based on hydrostatic equilibrium.<i>Results. <i/>For rotation periods, value obtained is 6.95 h whole 6.88 Trans-neptunian objects (TNOs)...
We present several lines of evidence, based on different kinds observations, and we conclude that it is likely rotational fission has occurred for a fraction the known trans-Neptunian objects (TNOs). It also number binary systems have formed from process in belt. show Haumea is, potentially, an example object suffered fission. Its current fast spin would be slight evolution primordial spin, rather than result catastrophic collision. This because percentage rotating faster 4 h not small...
In this work we aim to study if the variability in absolute magnitude of Chariklo and temporal variation spectral ice feature, even its disappearance 2007, can be explained by an icy ring system whose aspect angle changes with time. We modeled light reflected a as one described above explain variations on rings. Using X-Shooter at VLT obtained new reflectance spectra, here compared set data ones available literature. showed how water feature is visible 2013 accordance configuration, which...