Romy Rodríguez Martínez
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View article: Metallicities from High-resolution TRES Spectra with <tt>uberMS</tt> : Performance Benchmarks and Literature Comparison
Metallicities from High-resolution TRES Spectra with uberMS : Performance Benchmarks and Literature Comparison Open
As the field of exoplanetary astronomy has matured, demand has grown for precise stellar abundances to probe subtle correlations between stellar compositions and planetary demographics. However, drawing population-level conclusions from th…
View article: A Statistical Method for Constraining the Capability of the Habitable Worlds Observatory to Understand Ozone Onset Time in Earth Analogs
A Statistical Method for Constraining the Capability of the Habitable Worlds Observatory to Understand Ozone Onset Time in Earth Analogs Open
The oxygenation of Earth's atmosphere 2.3 billion years ago, which on exoplanets is expected to be most detectable via the UV ozone feature at $\sim$0.25 $μ$m, is often regarded as a sign of the emergence of photosynthetic life. On exoplan…
View article: Metallicities from High-Resolution TRES Spectra with uberMS: Performance Benchmarks and Literature Comparison
Metallicities from High-Resolution TRES Spectra with uberMS: Performance Benchmarks and Literature Comparison Open
As the field of exoplanetary astronomy has matured, demand has grown for precise stellar abundances to probe subtle correlations between stellar compositions and planetary demographics. However, drawing population-level conclusions from th…
View article: Identifying flare locations through exoplanet transit occultations
Identifying flare locations through exoplanet transit occultations Open
Low mass stars known as M dwarfs are the most common stars in the Galaxy, with long lifespans, a high occurrence rate of rocky planets, and close-in habitable zones. However, high stellar activity in the form of frequent flaring and any as…
View article: Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994*
Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994* Open
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite. TOI-4994b transits a G-type star ( V = 12.6 mag) with a mass, radius, and…
View article: Identifying Flare Locations Through Exoplanet Transit Occultations
Identifying Flare Locations Through Exoplanet Transit Occultations Open
M dwarfs are the most common stars in the galaxy, with long lifespans, a high occurrence rate of rocky planets, and close-in habitable zones. However, high stellar activity in the form of frequent flaring and any associated coronal mass ej…
View article: Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994
Discovery and Characterization of an Eccentric, Warm Saturn Transiting the Solar Analog TOI-4994 Open
We present the detection and characterization of TOI-4994b (TIC 277128619b), a warm Saturn-sized planet discovered by the NASA Transiting Exoplanet Survey Satellite (TESS). TOI-4994b transits a G-type star (V = 12.6 mag) with a mass, radiu…
View article: Revised temperatures for two benchmark M-dwarfs – outliers no more
Revised temperatures for two benchmark M-dwarfs – outliers no more Open
Well-characterized M-dwarfs are rare, particularly with respect to effective temperature. In this letter, we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures repor…
View article: A Gap in the Densities of Small Planets Orbiting M Dwarfs: Rigorous Statistical Confirmation Using the Open-source Code RhoPop
A Gap in the Densities of Small Planets Orbiting M Dwarfs: Rigorous Statistical Confirmation Using the Open-source Code RhoPop Open
Using mass–radius composition models, small planets ( R ≲ 2 R ⊕ ) are typically classified into three types: iron-rich, nominally Earth-like, and those with solid/liquid water and/or atmosphere. These classes are generally expected to be v…
View article: The benchmark M dwarf eclipsing binary CM Draconis with <i>TESS</i>: spots, flares, and ultra-precise parameters
The benchmark M dwarf eclipsing binary CM Draconis with <i>TESS</i>: spots, flares, and ultra-precise parameters Open
A gold standard for the study of M dwarfs is the eclipsing binary CM Draconis. It is rare because it is bright (Jmag = 8.5) and contains twin fully convective stars on an almost perfectly edge-on orbit. Both masses and radii were previousl…
View article: A Comparison of the Composition of Planets in Single-planet and Multiplanet Systems Orbiting M dwarfs
A Comparison of the Composition of Planets in Single-planet and Multiplanet Systems Orbiting M dwarfs Open
We investigate and compare the composition of M-dwarf planets in systems with only one known planet (“singles”) to those residing in multiplanet systems (“multis”) and the fundamental properties of their host stars. We restrict our analysi…
View article: Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds
Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds Open
Lava worlds are a potential emerging population of Super-Earths that are on close-in orbits around their host stars, with likely partially molten mantles. To date, few studies have addressed the impact of magma on the observed properties o…
View article: Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds
Fizzy Super-Earths: Impacts of Magma Composition on the Bulk Density and Structure of Lava Worlds Open
Lava worlds are a potential emerging population of Super-Earths that are on close-in orbits around their host stars with likely partially molten mantles. To date, few studies address the impact of magma on the observed properties of a plan…
View article: A Comparison of the Composition of Planets in Single- and Multi-Planet Systems Orbiting M dwarfs
A Comparison of the Composition of Planets in Single- and Multi-Planet Systems Orbiting M dwarfs Open
We investigate and compare the composition of M-dwarf planets in systems with only one known planet (``singles") to those residing in multi-planet systems (``multis") and the fundamental properties of their host stars. We restrict our anal…
View article: KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS
KELT-25 b and KELT-26 b: A Hot Jupiter and a Substellar Companion Transiting Young A Stars Observed by TESS Open
We present the discoveries of KELT-25 b (TIC 65412605, TOI-626.01) and KELT-26 b (TIC 160708862, TOI-1337.01), two transiting companions orbiting relatively bright, early A stars. The transit signals were initially detected by the KELT sur…
View article: The EBLM project X. Benchmark masses, radii, and temperatures for two fully convective M-dwarfs using K2
The EBLM project X. Benchmark masses, radii, and temperatures for two fully convective M-dwarfs using K2 Open
M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterization. We only know of dozens of M-dwarfs with fundamental par…
View article: A Reanalysis of the Composition of K2-106b: An Ultra-short-period Super-Mercury Candidate
A Reanalysis of the Composition of K2-106b: An Ultra-short-period Super-Mercury Candidate Open
We present a reanalysis of the K2-106 transiting planetary system, with a focus on the composition of K2-106b, an ultra-short-period, super-Mercury candidate. We globally model existing photometric and radial velocity data and derive a pla…
View article: Untangling the Sources of Abundance Dispersion in Low-metallicity Stars
Untangling the Sources of Abundance Dispersion in Low-metallicity Stars Open
We measure abundances of 12 elements (Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni) in a sample of 86 metal-poor (−2 ≲ [Fe/H] ≲ −1) subgiant stars in the solar neighborhood. Abundances are derived from high-resolution spectra taken with t…
View article: The Benchmark M Dwarf Eclipsing Binary CM Draconis With TESS: Spots, Flares and Ultra-Precise Parameters
The Benchmark M Dwarf Eclipsing Binary CM Draconis With TESS: Spots, Flares and Ultra-Precise Parameters Open
A gold standard for the study of M dwarfs is the eclipsing binary CM Draconis. It is rare because it is bright ($J_{\rm mag}=8.5$) and contains twin fully convective stars on an almost perfectly edge-on orbit. Both masses and radii were pr…
View article: Spectroscopy of TOI-1259B – an unpolluted white dwarf companion to an inflated warm Saturn
Spectroscopy of TOI-1259B – an unpolluted white dwarf companion to an inflated warm Saturn Open
TOI-1259 consists of a transiting exoplanet orbiting a main-sequence star, with a bound outer white dwarf (WDs) companion. Less than a dozen systems with this architecture are known. We conduct follow-up spectroscopy on the WD TOI-1259B us…
View article: Untangling the Sources of Abundance Dispersion in Low-Metallicity Stars
Untangling the Sources of Abundance Dispersion in Low-Metallicity Stars Open
We measure abundances of 12 elements (Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni) in a sample of 86 metal-poor ($-2 \lesssim \text{[Fe/H]} \lesssim -1$) subgiant stars in the solar neighborhood. Abundances are derived from high-resoluti…
View article: Is LTT 1445 Ab a Hycean World or a cold Haber World? Exploring the Potential of Twinkle to Unveil Its Nature
Is LTT 1445 Ab a Hycean World or a cold Haber World? Exploring the Potential of Twinkle to Unveil Its Nature Open
We explore the prospects for Twinkle to determine the atmospheric composition of the nearby terrestrial-like planet LTT 1445 Ab, including the possibility of detecting the potential biosignature ammonia (NH$_{3}$). At a distance of 6.9 pc,…
View article: The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2
The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2 Open
M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterisation. We only know of dozens of M-dwarfs with fundamental par…
View article: Revised Temperatures For Two Benchmark M-dwarfs -- Outliers No More
Revised Temperatures For Two Benchmark M-dwarfs -- Outliers No More Open
Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures report…
View article: A Reanalysis of the Composition of K2-106b: an Ultra-short Period Super-Mercury Candidate
A Reanalysis of the Composition of K2-106b: an Ultra-short Period Super-Mercury Candidate Open
We present a reanalysis of the K2-106 transiting planetary system, with a focus on the composition of K2-106b, an ultra-short period, super-Mercury candidate. We globally model existing photometric and radial velocity data and derive a pla…
View article: Spectroscopy of TOI-1259B -- an unpolluted white dwarf companion to an inflated warm Saturn
Spectroscopy of TOI-1259B -- an unpolluted white dwarf companion to an inflated warm Saturn Open
TOI-1259 consists of a transiting exoplanet orbiting a main sequence star, with a bound outer white dwarf companion. Less than a dozen systems with this architecture are known. We conduct follow-up spectroscopy on the white dwarf TOI-1259B…
View article: Testing the Limits of Precise Subgiant Characterization with APOGEE and Gaia: Opening a Window to Unprecedented Astrophysical Studies
Testing the Limits of Precise Subgiant Characterization with APOGEE and Gaia: Opening a Window to Unprecedented Astrophysical Studies Open
Given their location on the Hertzsprung-Russell (H-R) diagram, thoroughly characterized subgiant stars can place stringent constraints on a wide range of astrophysical problems. Accordingly, they are prime asteroseismic targets for the Tra…
View article: Characterization of Low-mass K2 Planet Hosts Using Near-infrared Spectroscopy
Characterization of Low-mass K2 Planet Hosts Using Near-infrared Spectroscopy Open
We present moderate resolution near-infrared spectra in the H , J , and K band of M-dwarf hosts to candidate transiting exoplanets discovered by NASA’s K2 mission. We employ known empirical relationships between spectral features and physi…
View article: ASASSN-18di: discovery of a $ΔV \sim 10$ flare on a mid-M dwarf
ASASSN-18di: discovery of a $ΔV \sim 10$ flare on a mid-M dwarf Open
We report and characterize a white-light superflare on a previously undiscovered M dwarf detected by the ASAS-SN survey. Employing various color-magnitude and color-spectral type relationships, we estimate several stellar parameters, inclu…
View article: ASASSN-18di: Discovery of a Powerful Flare on a Mid-M Dwarf
ASASSN-18di: Discovery of a Powerful Flare on a Mid-M Dwarf Open
We report and characterize a white-light superflare on a previously undiscovered M dwarf detected by the ASAS-SN survey. Employing various color-magnitude and color-spectral type relationships, we estimate several stellar parameters, inclu…