A5060610173- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
- Space Satellite Systems and Control
- Radioactive Decay and Measurement Techniques
- Planetary Science and Exploration
- Electron and X-Ray Spectroscopy Techniques
- Spacecraft Design and Technology
- Particle Detector Development and Performance
- Zeolite Catalysis and Synthesis
- Spectroscopy and Laser Applications
University of New Mexico
2009-2023
New College of Florida
2020
Université Toulouse III - Paul Sabatier
2006
Goddard Space Flight Center
1997
We present the discovery and characterisation of two transiting planets observed by \textit{TESS} in light curves young bright (V=9.67) star HD73583 (TOI-560). perform an intensive spectroscopic photometric space- ground-based follow-up order to confirm characterise system. found that is a ($\sim 500$~Myr) active with rotational period $12.08 \pm 0.11 $\,d, mass radius $ 0.73 0.02 M_\odot$ $0.65 R_\odot$, respectively. b ($P_b=6.3980420 _{ - 0.0000062 }^{+0.0000067}$ d) has $10.2...
We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single transit events in light curves generated from full frame images Transiting Exoplanet Survey Satellite (TESS). Follow-up radial velocity measurements additional used to determine periods confirm planetary nature candidates. The planets orbit slightly metal-rich late F- early G-type stars. find that TOI 4406b has a mass $M_P$= 0.30 $\pm$...
Context. Thanks to the relative ease of finding and characterizing small planets around M-dwarf stars, these objects have become cornerstones in field exoplanet studies. The current paucity long-period orbits M dwarfs makes such particularly compelling as they provide clues about formation evolution systems. Aims. In this study we present discovery TOI-2257 b (TIC 198485881), a (35 d) sub-Neptune orbiting an M3 star at 57.8 pc. Its transit depth is 0.4%, large enough be detected with...
The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations many planets. We present characterization nine one planet candidate both NASA TESS ESA CHEOPS observations, which adds to overall population bordering valley. While four our - TOI 118 b, 455 560 562 b have already been published, we vet validate transit signals as planetary using follow-up observations five new planets,...
Abstract We report the discovery and validation of two long-period giant exoplanets orbiting early K dwarf TOI-4600 ( V = 12.6, T 11.9), first detected using observations from Transiting Exoplanet Survey Satellite (TESS) by TESS Single Transit Planet Candidate Working Group. The inner planet, b, has a radius 6.80 ± 0.31 R ⊕ an orbital period 82.69 days. outer c, 9.42 0.42 482.82 days, making it longest-period confirmed or validated planet discovered to date. combine photometry ground-based...
Much of the science from exoplanets detected by TESS mission relies on precisely predicted transit times that are needed for many follow-up characterization studies. We investigate ephemeris deterioration simulated planets and find ephemerides 81% those will have expired (i.e. 1$\sigma$ mid-transit time uncertainties greater than 30 minutes) one year after their observations. verify these results using a sample planet candidates as well. In particular, would be recommended JWST targets...
Abstract We report the discovery of two TESS sub-Neptunes orbiting early M dwarf TOI-904 (TIC 261257684). Both exoplanets, b and c, were initially observed in Sector 12 with twin sizes <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>2.426</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.157</mml:mn> <mml:mo>+</mml:mo> <mml:mn>0.163</mml:mn> </mml:msubsup> </mml:math> <mml:mn>2.167</mml:mn> <mml:mn>0.118</mml:mn>...
We report the discovery of two TESS sub-Neptunes orbiting early M dwarf TOI-904 (TIC 261257684). Both exoplanets, b and c, were initially observed in sector 12 with twin sizes 2.49R$_\oplus$ 2.31R$_\oplus$, respectively. Through observations five additional sectors primary mission first second extended missions, orbital periods both planets measured to be 10.887$\pm$0.001 83.999$\pm$0.001 days, Reconnaissance radial velocity measurements (taken EULER/CORALIE) high resolution speckle imaging...
The radius valley carries implications for how the atmospheres of small planets form and evolve, but this feature is visible only with highly precise characterizations many planets. We present characterization nine one planet candidate both NASA TESS ESA CHEOPS observations, which adds to overall population bordering valley. While four our - TOI 118 b, 455 560 562 b have already been published, we vet validate transit signals as planetary using follow-up observations five new planets,...
We report the discovery and orbital characterization of three new transiting warm giant planets. These systems were initially identified as presenting single transit events in light curves generated from full frame images Transiting Exoplanet Survey Satellite (TESS). Follow-up radial velocity measurements additional used to determine periods confirm planetary nature candidates. The planets orbit slightly metal-rich late F- early G-type stars. find that TOI 4406b has a mass $M_P$= 0.30 $\pm$...
We report the discovery and validation of two long-period giant exoplanets orbiting early K dwarf TOI-4600 (V=12.6, T=11.9), first detected using observations from Transiting Exoplanet Survey Satellite (TESS) by TESS Single Transit Planet Candidate Working Group (TSTPC-WG). The inner planet, b, has a radius 6.80$\pm$0.31 R$_{\oplus}$ an orbital period 82.69 d. outer c, 9.42$\pm$0.42 482.82 d, making it longest-period confirmed or validated planet discovered to date. combine photometry...
The TGRS (Transient Gamma-Ray Spectrometer) experiment is a high-resolution germanium detector launched on the WIND satellite Nov. 1, 1994. Although primarily intended to study gamma-ray bursts and solar flares, also has capability of studying steady sources near ecliptic plane (including Galactic Center). We present here preliminary results narrow 511 keV annihilation line from general direction Center obtained occultation mode. Data are presented for approximately 2 years beginning 1 Jan....
The search for gamma-ray line emission from the radioactive decay of 60Fe figures among prime scientific objectives INTEGRAL mission. is believed to be primarily produced in core-collapse supernovae, although other sites, such as carbon deflagration supernovae or intermediate mass AGB stars have also been suggested. We present first results our 1173 and 1332 keV lines SPI data mission year. So far we can only report upper flux limits whose levels are determined by systematic uncertainties...