Max Brodheim
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View article: Discovery of the pre-main-sequence eclipsing binary MML 48
Discovery of the pre-main-sequence eclipsing binary MML 48 Open
Aims. We present the discovery of the eclipsing binary MML 48 , which is a member of Upper Centaurus Lupus, has an associated age of 16 Myr, and is composed of two young, low-mass stars. Methods. We used space- and ground-based observation…
View article: SCALES-DRP: a data reduction pipeline for an upcoming Keck thermal infrared spectrograph
SCALES-DRP: a data reduction pipeline for an upcoming Keck thermal infrared spectrograph Open
We present the end-to-end data reduction pipeline for SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy), the upcoming thermal-infrared, diffraction-limited imager, and low and medium-resolution integral field spect…
View article: The Compositions of Rocky Planets in Close-in Orbits Tend to Be Earth-like
The Compositions of Rocky Planets in Close-in Orbits Tend to Be Earth-like Open
Hundreds of exoplanets between 1 and 1.8 times the size of Earth have been discovered on close-in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host g…
View article: A Hot Jupiter with a Retrograde Orbit Around A Sun-like Star and a Toy Model of Hot Jupiters in Wide Binary Star Systems
A Hot Jupiter with a Retrograde Orbit Around A Sun-like Star and a Toy Model of Hot Jupiters in Wide Binary Star Systems Open
We report an observation of a transit of the hot Jupiter (HJ) KELT-23A b with the Keck Planet Finder spectrograph and a measurement of the sky-projected obliquity ( λ ) of its Sun-like ( T eff ≈ 5900 K) host star. We measured a projected s…
View article: TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf
TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 ± 0.041 R ⊕ ) ultra-short-period (USP) planet orbiting a nearby (∼20 pc) M dwarf. Using the newly commissioned Keck Planet Finder spectrograph, we have measured the mass of TO…
View article: TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf
TOI-6324b: An Earth-Mass Ultra-Short-Period Planet Transiting a Nearby M Dwarf Open
We report the confirmation of TOI-6324 b, an Earth-sized (1.059 $\pm$ 0.041 R$_\oplus$) ultra-short-period (USP) planet orbiting a nearby ($\sim$20 pc) M dwarf. Using the newly commissioned Keck Planet Finder (KPF) spectrograph, we have me…
View article: Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ( …
View article: Robust Support for Semi-automated Reductions of Keck/NIRSPEC Data Using PypeIt
Robust Support for Semi-automated Reductions of Keck/NIRSPEC Data Using PypeIt Open
We present a data reduction pipeline (DRP) for Keck/Near InfraRed SPECtrograph (NIRSPEC) built as an addition to the PypeIt Python package. The DRP is capable of reducing multi-order echelle data taken both before and after the detector up…
View article: Robust support for semi-automated reductions of Keck/NIRSPEC data using PypeIt
Robust support for semi-automated reductions of Keck/NIRSPEC data using PypeIt Open
We present a data reduction pipeline (DRP) for Keck/NIRSPEC built as an addition to the PypeIt Python package. The DRP is capable of reducing multi-order echelle data taken both before and after the detector upgrade in 2018. As part of dev…
View article: The HD 191939 Exoplanet System is Well Aligned and Flat
The HD 191939 Exoplanet System is Well Aligned and Flat Open
We report the sky-projected spin–orbit angle λ for HD 191939 b, the innermost planet in a six-planet system, using Keck/KPF to detect the Rossiter–McLaughlin (RM) effect. Planet b is a sub-Neptune with radius 3.4 ± 0.8 R ⊕ and mass 10.0 ± …
View article: The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1
The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1 Open
We introduce the OATMEAL survey, an effort to measure the obliquities of stars with transiting brown dwarf companions. We observed a transit of the close-in ( P orb = 1.74 days) brown dwarf GPX-1 b using the Keck Planet Finder spectrograph…
View article: KPF Confirms a Polar Orbit for KELT-18 b
KPF Confirms a Polar Orbit for KELT-18 b Open
We present the first spectroscopic transit results from the newly commissioned Keck Planet Finder on the Keck-I telescope at W. M. Keck Observatory. We observed a transit of KELT-18 b, an inflated ultrahot Jupiter orbiting a hot star ( T e…
View article: The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like
The Compositions of Rocky Planets in Close-in Orbits Tend to be Earth-Like Open
Hundreds of exoplanets between 1-1.8 times the size of the Earth have been discovered on close in orbits. However, these planets show such a diversity in densities that some appear to be made entirely of iron, while others appear to host g…
View article: The HD 191939 Exoplanet System is Well-Aligned and Flat
The HD 191939 Exoplanet System is Well-Aligned and Flat Open
We report the sky-projected spin-orbit angle $λ$ for HD 191939 b, the innermost planet in a 6 planet system, using Keck/KPF to detect the Rossiter-McLaughlin (RM) effect. Planet b is a sub-Neptune with radius 3.4 $\pm$ 0.8 R$_{\oplus}$ and…
View article: An Earth-sized Planet on the Verge of Tidal Disruption
An Earth-sized Planet on the Verge of Tidal Disruption Open
TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R ⊕ ) with an orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine the planet’s mass to be 1.44 ± 0.14 M ⊕ . The…
View article: Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b Open
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrated to their current orbits, perhaps via high-eccentricity m…
View article: A Testbed for Tidal Migration: the 3D Architecture of an Eccentric Hot Jupiter HD 118203 b Accompanied by a Possibly Aligned Outer Giant Planet
A Testbed for Tidal Migration: the 3D Architecture of an Eccentric Hot Jupiter HD 118203 b Accompanied by a Possibly Aligned Outer Giant Planet Open
Characterizing outer companions to hot Jupiters plays a crucial role in deciphering their origins. We present the discovery of a long-period giant planet, HD 118203 c ($m_{c}=11.79^{+0.69}_{-0.63}\ \mathrm{M_{J}}$, $a_{c}=6.28^{+0.10}_{-0.…
View article: Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b Open
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrated to their current orbits, perhaps via high-eccentricity m…
View article: The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1
The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1 Open
We introduce the OATMEAL survey, an effort to measure the obliquities of stars with transiting brown dwarf companions. We observed a transit of the close-in ($P_{\rm orb} = 1.74 \,$ days) brown dwarf GPX-1 b using the Keck Planet Finder (K…
View article: KPF Confirms a Polar Orbit for KELT-18 b
KPF Confirms a Polar Orbit for KELT-18 b Open
We present the first spectroscopic transit results from the newly commissioned Keck Planet Finder on the Keck-I telescope at W. M. Keck Observatory. We observed a transit of KELT-18 b, an inflated ultra-hot Jupiter orbiting a hot star ($T_…
View article: An Earth-sized Planet on the Verge of Tidal Disruption
An Earth-sized Planet on the Verge of Tidal Disruption Open
TOI-6255~b (GJ 4256) is an Earth-sized planet (1.079$\pm0.065$ $R_\oplus$) with an orbital period of only 5.7 hours. With the newly commissioned Keck Planet Finder (KPF) and CARMENES spectrographs, we determined the planet's mass to be 1.4…
View article: Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS
Asteroseismology of the Nearby K-Dwarf $σ$ Draconis using the Keck Planet Finder and TESS Open
Asteroseismology of dwarf stars cooler than the Sun is very challenging due to the low amplitudes and rapid timescales of oscillations. Here, we present the asteroseismic detection of solar-like oscillations at 4-minute timescales ($ν_{\ma…
View article: Observers’ data access portal: realtime streaming for astronomical data
Observers’ data access portal: realtime streaming for astronomical data Open
The W. M. Keck Observatory Archive (KOA) has released the Observers Data Access Portal (ODAP), a web-application that delivers astronomical data from the W. M. Keck Observatory to the scheduled program's principal investigator and their co…
View article: TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence
TESS Giants Transiting Giants. VI. Newly Discovered Hot Jupiters Provide Evidence for Efficient Obliquity Damping after the Main Sequence Open
The degree of alignment between a star’s spin axis and the orbital plane of its planets (the stellar obliquity) is related to interesting and poorly understood processes that occur during planet formation and evolution. Hot Jupiters orbiti…
View article: Advancements in Streamlining Time-Domain and Multi-Messenger Astronomy Follow-Up Infrastructure at Keck Observatory
Advancements in Streamlining Time-Domain and Multi-Messenger Astronomy Follow-Up Infrastructure at Keck Observatory Open
With active time-domain surveys like the Zwicky Transient Facility, the anticipated Rubin Observatory's Legacy Survey of Space and Time, and multi-messenger experiments such as LIGO/VIRGO/KANGRA for gravitational wave detection and IceCube…
View article: Real-time Data Ingestion at the Keck Observatory Archive (KOA)
Real-time Data Ingestion at the Keck Observatory Archive (KOA) Open
Since February of this year, KOA began to prepare, transfer, and ingest data as they were acquired in near-real time; in most cases data are available to observers through KOA within one minute of acquisition. Real-time ingestion will be c…