A5029206538- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical and nuclear sciences
- Astrophysics and Star Formation Studies
- Extraction and Separation Processes
- Gamma-ray bursts and supernovae
- Geomagnetism and Paleomagnetism Studies
- Astronomical Observations and Instrumentation
Pennsylvania State University
2024
The Ohio State University
2022
Abstract Gaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity (RV) data are needed for definitive confirmation. Here we present RV follow-up observations 28 M and K with candidate astrometric which led confirmation two systems, Gaia-4b Gaia-5b, identification five systems that single lined require additional confirm as refutation 21 stellar binaries. a massive planet ( = 11.8 ± 0.7 J ) in P 571.3 1.4 day...
All of the known circumbinary planets are large (> 3 Earth radii). Whilst observational biases may account for this dearth small planets, in paper we propose a theoretical explanation. Most near stability limit, interspersed between potentially unstable 5 : 1, 6 1 and 7 mean motion resonances with binary. It is believed that these did not form situ, but rather migrated from farther out disc, hence passed through resonances. Planets expected to migrate at speed proportional their mass, slower...
Abstract The LHS 1610 system consists of a nearby ( d = 9.7 pc) M5 dwarf hosting candidate brown companion in 10.6 days, eccentric e ∼ 0.37) orbit. We confirm this designation and estimate its mass <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msubsup> <mml:mrow> <mml:mn>49.5</mml:mn> </mml:mrow> <mml:mo>−</mml:mo> <mml:mn>3.5</mml:mn> <mml:mo>+</mml:mo> <mml:mn>4.3</mml:mn> </mml:msubsup> </mml:math> M Jup ) inclination (114.5° <mml:mrow/>...
Resonant locking of two planets is an expected outcome convergent disc migration. The subsequently migrate together as a resonant pair. In the context circumbinary planets, truncated internally by binary. If there were only single planet, then this inner edge would provide natural parking location. However, for migrating in resonance will be tension between planet stopping at edge, and outer continuing to torqued inwards. paper we study effect, showing that function planet-planet mass ratio....
Gaia astrometry of nearby stars is precise enough to detect the tiny displacements induced by substellar companions, but radial velocity data are needed for definitive confirmation. Here we present follow-up observations 28 M and K with candidate astrometric which led confirmation two systems, Gaia-4b Gaia-5b, refutation 21 systems as stellar binaries. a massive planet ($M = 11.8 \pm 0.7 \:\mathrm{M_J}$) in $P 571.3 1.4\:\mathrm{day}$ orbit projected semi-major axis $a_0=0.312...
A significant barrier to achieving the radial velocity (RV) measurement accuracy and precision required characterize terrestrial mass exoplanets is existence of time-variable features in measured spectra, from both telluric absorption stellar variability, which affect line shapes can cause apparent RV shifts. Reaching desired using traditional techniques often requires avoiding lines contaminated by variability and/or changing tellurics, thus discarding a large fraction spectrum, lowering...
With close to three years of observations in hand, the NEID Earth Twin Survey (NETS) is starting unearth new astrophysical signals for a curated sample bright, radial velocity (RV)-quiet stars. We present discovery first NETS exoplanet, HD 86728 b, $m_p\sin i = 9.16^{+0.55}_{-0.56}\ \rm{M}_\oplus$ planet on circular, $P=31.1503^{+0.0062}_{-0.0066}$ d orbit, thereby confirming candidate signal identified by Hirsch et al. (2021). confirm planetary origin detected signal, which has...
Abstract With close to 3 yr of observations in hand, the NEID Earth Twin Survey (NETS) is starting unearth new astrophysical signals for a curated sample bright, radial velocity (RV)-quiet stars. We present discovery first NETS exoplanet, HD 86728b, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>m</mml:mi> </mml:mrow> <mml:mi>p</mml:mi> </mml:msub> <mml:mi>sin</mml:mi> <mml:mi>i</mml:mi> <mml:mo>=</mml:mo> <mml:msubsup>...
TOI-1259 consists of a transiting exoplanet orbiting main sequence star, with bound outer white dwarf companion. Less than dozen systems this architecture are known. We conduct follow-up spectroscopy on the TOI-1259B using Large Binocular Telescope (LBT) to better characterise it. observe only strong hydrogen lines, making DA dwarf. see no evidence heavy element pollution, which would have been planetary material around Such pollution is seen in ~ 25 - 50% dwarfs, but it unknown if rate...
We characterize the LHS 1610 system, a nearby ($d=9.7$ pc) M5 dwarf hosting brown in $10.6$ day, eccentric ($e \sim 0.37$) orbit. A joint fit of available Gaia two-body solution, discovery radial velocities (RVs) from TRES, and new RVs obtained with Habitable-zone Planet Finder, yields an orbital inclination $117.2\pm0.9^\circ$ mass constraint $50.9\pm0.9$ M$_J$. This gives b second most precise dwarfs orbiting M stars within 25pc. highlight discrepancy between solution eccentricity ($e=0.52...
TOI-1259 consists of a transiting exoplanet orbiting main sequence star, with bound outer white dwarf companion. Less than dozen systems this architecture are known. We conduct follow-up spectroscopy on the TOI-1259B using Large Binocular Telescope (LBT) to better characterise it. observe only strong hydrogen lines, making DA dwarf. see no evidence heavy element pollution, which would have been planetary material around Such pollution is seen in ~ 25 - 50% dwarfs, but it unknown if rate...