A5063050161- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Galaxies: Formation, Evolution, Phenomena
- Mentoring and Academic Development
- Calibration and Measurement Techniques
- Doctoral Education Challenges and Solutions
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Spacecraft and Cryogenic Technologies
- Advanced Statistical Methods and Models
- Career Development and Diversity
The Ohio State University
2021-2025
Tufts University
2024
University of Maryland, College Park
2021
Abstract Accurate limb-darkening models are needed for accurate characterisation of eclipsing binary stars and transiting exoplanets from the analysis their light curves. The observed in solar-type curves hot-Jupiter systematically less steep than predicted by stellar model atmospheres that do not account magnetic field. Hot-Jupiter host tend to be metal rich ([Fe/H] ≈ 0.25) leading a lack low- solar-metallicity targets previous studies, so we have analysed TESS sample 19 with M-dwarf...
Abstract We present high-resolution optical emission spectroscopy observations of the ultrahot Jupiters (UHJs) TOI-1431 b and TOI-1518 using PEPSI spectrograph on LBT. detect lines from Fe i with a significance 5.68 σ 7.68 for TOI 1431 b, respectively. also tentatively Cr at 4.32 . For we Ni , ii Mg levels ranging 3–4 Detection indicates that both planets possess temperature inversions in their atmospheres, providing further evidence ubiquity stratospheres among UHJs. By analyzing population...
ABSTRACT Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and predicted by theoretical structure models. This ‘radius inflation’ problem could an impact on both exoplanetary science. We present the final results our observation programme with CHaracterising ExOPlanet Satellite (CHEOPS) to obtain high-precision light curves eclipsing binaries companions (EBLMs). Combined spectroscopic orbits solar-type companions, we can derive masses, radii,...
ABSTRACT M-dwarfs are the most abundant stars in galaxy and popular targets for exoplanet searches. However, their intrinsic faintness complex spectra inhibit precise characterization. We only know of dozens with fundamental parameters mass, radius, effective temperature characterized to better than a few per cent. Eclipsing binaries remain robust means stellar Here we present two from Binary Low Mass (EBLM) survey that were observed K2: EBLM J0055-00 J2217-04. Combined HARPS CORALIE...
ABSTRACT In the hunt for Earth-like exoplanets, it is crucial to have reliable host star parameters, as they a direct impact on accuracy and precision of inferred parameters any discovered exoplanet. For stars with masses between 0.35 0.5 M⊙, an unexplained radius inflation observed relative typical stellar models. However, fully convective objects mass below not known whether this present, there are fewer accurate measurements in regime. Low-mass eclipsing binaries present unique...
ABSTRACT Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary offer a first detailed view into our understanding planet formation dynamical evolution. The BEBOP (binaries escorted by planets) radial velocity survey plays special role in this adventure as it focuses on eclipsing single-lined binaries with an FGK dwarf primary M secondary allowing for the highest precision using HARPS SOPHIE...
ABSTRACT EBLM J0608$-$59/TOI-1338/BEBOP-1 is a 12$^{\rm th}$-magnitude, F9 V star in an eclipsing binary with much fainter M dwarf companion on wide, eccentric orbit (P = 14.6 d). The orbited by two circumbinary planets: one transiting 95-d and non-transiting 215-d orbit. We have used high-precision photometry from the TESS mission combined direct mass measurements for stars published recently to measure following model-independent radii: $R_1 1.32 \pm 0.02 {\rm R}_{\odot }$, $R_2 0.309...
Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary offer a first detailed view into our understanding planet formation dynamical evolution. The BEBOP (Binaries Escorted by Orbiting Planets) radial velocity survey plays special role in this adventure as it focuses on eclipsing single-lined binaries with an FGK dwarf primary M secondary allowing for the highest-radial precision using HARPS SOPHIE...
EBLM J0608-59 / TOI-1338 BEBOP-1 is a 12th-magnitude, F9V star in an eclipsing binary with much fainter M-dwarf companion on wide, eccentric orbit (P=14.6 d). The orbited by two circumbinary planets: one transiting 95-day and non-transiting 215-day orbit. We have used high-precision photometry from the TESS mission combined direct mass measurements for stars published recently to measure following model-independent radii: $R_1 = 1.32 \pm 0.02 R_{\odot}$, $R_2 0.309 0.004 R_{\odot}$. Using...
We present high-resolution optical emission spectroscopy observations of the ultra hot Jupiters (UHJs) TOI-1431 b and TOI-1518 using PEPSI spectrograph on LBT. detect lines from Fe I with a significance 5.40$\sigma$ 7.85$\sigma$ for TOI 1431 b, respectively. also Cr at $4.23\sigma$. For we tentatively Ni I, Mg as well possibly CaH, levels ranging $3-4\sigma$. Detection indicates that both planets possess temperature inversions in their atmospheres, providing further evidence ubiquity...
Abstract Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported be hotter or colder by ≈1000 K comparison both models the majority of other literature. By modelling secondary eclipses original data new TESS derive significantly different temperatures: 2865 ± 27 for 1571511B 3081 32 24465B 3114 K2. These not outliers....
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and predicted by theoretical structure models. This ``radius inflation'' problem could an impact on both exoplanetary science. We present the final results our observation programme with CHEOPS satellite to obtain high-precision light curves eclipsing binaries low mass companions (EBLMs). Combined spectroscopic orbits solar-type companion, we can derive masses, effective temperatures 23 M-dwarf...
Transiting planet systems offer the best opportunity to measure masses and radii of a large sample planets their host stars. However, relative photometry radial velocity measurements alone only constrain density star. Thus, there is one-parameter degeneracy in mass radius star, by extension planet. Several theoretical, semi-empirical, nearly empirical methods have been used break this independently star planets(s). As we approach an era few percent precisions on some these properties, it...
We present new Spitzer transit observations of four K2 transiting sub-Neptunes: K2-36c, K2-79b, K2-167b, and K2-212b. derive updated orbital ephemerides radii for these planets based on a joint analysis the Spitzer, TESS, photometry. use EVEREST pipeline to provide improved photometry, by detrending instrumental noise K2's pointing jitter. used pixel level decorrelation method reduce systematic effects. modeled effect possible blended eclipsing binaries, seeking validate via achromaticity...
As members of the student-initiated and student-led Women in Physics (WiP) organization (now called "Physicists Underrepresented Genders") Department at University Maryland College Park, we describe a mentoring program that started 2012.The WiP group prioritizes creating welcoming social environment for women gender-diverse physics community, as well opportunities to network learn about academic career development.Each year, long-standing pairs interested undergraduates with graduate student...
In the hunt for Earth-like exoplanets it is crucial to have reliable host star parameters, as they a direct impact on accuracy and precision of inferred parameters any discovered exoplanet. For stars with masses between 0.35 0.5 ${\rm M_{\odot}}$ an unexplained radius inflation observed relative typical stellar models. However, fully convective objects mass below not known whether this present there are fewer accurate measurements in regime. Low-mass eclipsing binaries unique opportunity...
Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported be hotter or colder by approximately 1000 K comparison both models the majority of literature. By modelling secondary eclipses original data new TESS derive significantly different which not outliers. Removing discrepancy allows these truly benchmarks. Our work...
M-dwarfs are the most abundant stars in galaxy and popular targets for exoplanet searches. However, their intrinsic faintness complex spectra inhibit precise characterisation. We only know of dozens with fundamental parameters mass, radius effective temperature characterised to better than a few per cent. Eclipsing binaries remain robust means stellar Here we present two from Binary Low Mass (EBLM) survey that were observed K2: EBLM J0055-00 J2217-04. Combined HARPS CORALIE spectroscopy,...