Songhu Wang
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View article: Early Evidence for Polar Orbits of Sub-Saturns around Hot Stars
Early Evidence for Polar Orbits of Sub-Saturns around Hot Stars Open
Sub-Saturns have been reported to preferentially occupy near-polar orbits, but this conclusion has so far been based primarily on systems with cool host stars; obliquity measurements for sub-Saturns orbiting hot stars remain scarce. Expand…
View article: The origin and tidal evolution of hot Jupiters constrained by a broken age–frequency relation
The origin and tidal evolution of hot Jupiters constrained by a broken age–frequency relation Open
View article: Early Evidence for Polar Orbits of Sub-Saturns Around Hot Stars
Early Evidence for Polar Orbits of Sub-Saturns Around Hot Stars Open
Sub-Saturns have been reported to preferentially occupy near-polar orbits, but this conclusion has so far been based primarily on systems with cool host stars; obliquity measurements for sub-Saturns orbiting hot stars remain scarce. Expand…
View article: Migration and Evolution of giant ExoPlanets (MEEP). II. Super-Jupiters and Lithium-rich host stars
Migration and Evolution of giant ExoPlanets (MEEP). II. Super-Jupiters and Lithium-rich host stars Open
Although hot Jupiters were the first exoplanets discovered orbiting main-sequence stars, the dominant mechanisms through which they form and evolve are not known. To address the questions surrounding their origins, the Migration and Evolut…
View article: TOI-880 is an Aligned, Coplanar, Multiplanet System
TOI-880 is an Aligned, Coplanar, Multiplanet System Open
Although many cases of stellar spin–orbit misalignment are known, it is usually unclear whether a single planet’s orbit was tilted or if the entire protoplanetary disk was misaligned. Measuring stellar obliquities in multitransiting planet…
View article: Data for paper "TOI-880 is an Aligned, Coplanar, Multi-planet System"
Data for paper "TOI-880 is an Aligned, Coplanar, Multi-planet System" Open
Although many cases of stellar spin-orbit misalignment are known, it is usually unclear whether a single planet's orbit was tilted or if the entire protoplanetary disk was misaligned. Measuring stellar obliquities in multi-transiting plane…
View article: From Misaligned Sub-Saturns to Aligned Brown Dwarfs: The Highest <i>M</i> <sub> <i>p</i> </sub>/<i>M</i> <sub>*</sub> Systems Exhibit Low Obliquities, Even around Hot Stars*
From Misaligned Sub-Saturns to Aligned Brown Dwarfs: The Highest <i>M</i> <sub> <i>p</i> </sub>/<i>M</i> <sub>*</sub> Systems Exhibit Low Obliquities, Even around Hot Stars* Open
We present a pattern emerging from stellar obliquity measurements in single-star systems: planets with high planet-to-star mass ratios ( M P / M * ≥ 2 × 10 −3 )—such as super-Jupiters, brown dwarf companions, and M dwarfs hosting Jupiter-l…
View article: Statistical Reevaluation of the Ultra-short-period Planet Classification Boundary: Smaller Planets within 1 Day, Larger Period Ratios below 2 Days
Statistical Reevaluation of the Ultra-short-period Planet Classification Boundary: Smaller Planets within 1 Day, Larger Period Ratios below 2 Days Open
Terrestrial worlds with P < 1 day, known as ultra-short-period planets (USPs), comprise a physically distinct population whose origins may be attributed to various possible formation channels within multiplanet systems. However, the conven…
View article: Evidence for Primordial Alignment II: Insights from Stellar Obliquity Measurements for Hot Jupiters in Compact Multiplanet Systems
Evidence for Primordial Alignment II: Insights from Stellar Obliquity Measurements for Hot Jupiters in Compact Multiplanet Systems Open
A significant fraction of hot Jupiters have orbital axes misaligned with their host stars’ spin axes. The large stellar obliquities of these giants have long been considered potential signatures of high-eccentricity migration, which is exp…
View article: Short-period Small Planets with High Mutual Inclinations are More Common around Metal-rich Stars
Short-period Small Planets with High Mutual Inclinations are More Common around Metal-rich Stars Open
We present a correlation between the stellar metallicities and the mutual inclinations of multiplanet systems hosting short-period small planets ( a / R ⋆ < 12, R p < 4 R ⊕ ). We analyzed 89 multiplanet systems discovered by Kepler, K2, an…
View article: Statistical Reevaluation of the USP Classification Boundary: Smaller Planets Within 1 Day, Larger Period Ratios Below 2 Days
Statistical Reevaluation of the USP Classification Boundary: Smaller Planets Within 1 Day, Larger Period Ratios Below 2 Days Open
Terrestrial worlds with $P < 1$ day, known as ultra-short period planets (USPs), comprise a physically distinct population whose origins may be attributed to various possible formation channels within multi-planet systems. However, the con…
View article: Short-Period Small Planets with High Mutual Inclinations are more Common around Metal-Rich Stars
Short-Period Small Planets with High Mutual Inclinations are more Common around Metal-Rich Stars Open
We present a correlation between the stellar metallicities and the mutual inclinations of multi-planet systems hosting short-period small planets (a/Rs<12, Rp<4Re). We analyzed 89 multi-planet systems discovered by Kepler, K2, and TESS, wh…
View article: From Misaligned Sub-Saturns to Aligned Brown Dwarfs: The Highest $M_{\rm p}/M{_*}$ Systems Exhibit Low Obliquities, Even around Hot Stars
From Misaligned Sub-Saturns to Aligned Brown Dwarfs: The Highest $M_{\rm p}/M{_*}$ Systems Exhibit Low Obliquities, Even around Hot Stars Open
We present a pattern emerging from stellar obliquity measurements in single-star systems: planets with high planet-to-star mass ratios ($M_{\rm p}/M{_*}$$>$ $2\times10^{-3}$) -- such as super-Jupiters, brown dwarf companions, and M-dwarfs …
View article: Origins of Super Jupiters: TOI-2145b has a Moderately Eccentric and Nearly Aligned Orbit
Origins of Super Jupiters: TOI-2145b has a Moderately Eccentric and Nearly Aligned Orbit Open
Super Jupiters are giant planets with several Jupiter masses. It remains an open question whether these planets originate with such high masses or grow through collisions. Previous work demonstrates that warm super Jupiters tend to have mo…
View article: Origins of Super Jupiters: TOI-2145b Has a Moderately Eccentric and Nearly Aligned Orbit
Origins of Super Jupiters: TOI-2145b Has a Moderately Eccentric and Nearly Aligned Orbit Open
Super Jupiters are giant planets with several Jupiter masses. It remains an open question whether these planets originate with such high masses or grow through collisions. Previous work demonstrates that warm super Jupiters tend to have mo…
View article: SOLES XII. The Aligned Orbit of TOI-2533 b, a Transiting Brown Dwarf Orbiting an F8-type Star
SOLES XII. The Aligned Orbit of TOI-2533 b, a Transiting Brown Dwarf Orbiting an F8-type Star Open
Brown dwarfs occupy a middle ground in mass space between gaseous giant planets and ultracool dwarf stars, and the characterisation of their orbital orientations may shed light on how these neighbouring objects form. We present an analysis…
View article: Single-star Warm-Jupiter Systems Tend to Be Aligned, Even around Hot Stellar Hosts: No T <sub>eff</sub>–λ Dependency*
Single-star Warm-Jupiter Systems Tend to Be Aligned, Even around Hot Stellar Hosts: No T <sub>eff</sub>–λ Dependency* Open
The stellar obliquity distribution of warm-Jupiter systems is crucial for constraining the dynamical history of Jovian exoplanets, as the warm Jupiters’ tidal detachment likely preserves their primordial obliquity. However, the sample size…
View article: Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems
Evidence for Primordial Alignment: Insights from Stellar Obliquity Measurements for Compact Sub-Saturn Systems Open
Despite decades of effort, the mechanisms by which the spin axis of a star and the orbital axes of its planets become misaligned remain elusive. In particular, it is of great interest whether the large spin–orbit misalignments observed are…
View article: Single-Star Warm-Jupiter Systems Tend to Be Aligned, Even Around Hot Stars
Single-Star Warm-Jupiter Systems Tend to Be Aligned, Even Around Hot Stars Open
The stellar obliquity distribution of warm-Jupiter systems is crucial for constraining the dynamical history of Jovian exoplanets, as the warm Jupiters' tidal detachment likely preserves their primordial obliquity. However, the sample size…
View article: SOLES XII. The Aligned Orbit of TOI-2533 b, a Transiting Brown Dwarf Orbiting an F8-type Star
SOLES XII. The Aligned Orbit of TOI-2533 b, a Transiting Brown Dwarf Orbiting an F8-type Star Open
Brown dwarfs occupy a middle ground in mass space between gaseous giant planets and ultra-cool dwarf stars, and the characterisation of their orbital orientations may shed light on how these neighbouring objects form. We present an analysi…
View article: A Larger Sample Confirms Small Planets around Hot Stars Are Misaligned <sup>∗</sup>
A Larger Sample Confirms Small Planets around Hot Stars Are Misaligned <sup>∗</sup> Open
The distribution of stellar obliquities provides critical insight into the formation and evolution pathways of exoplanets. In the past decade, it was found that hot stars hosting hot Jupiters are more likely to have high obliquities than c…
View article: Peas-in-a-pod across the Radius Valley: Rocky Systems Are Less Uniform in Mass but More Uniform in Size and Spacing
Peas-in-a-pod across the Radius Valley: Rocky Systems Are Less Uniform in Mass but More Uniform in Size and Spacing Open
The ubiquity of “peas-in-a-pod” architectural patterns and the existence of the radius valley each presents a striking population-level trend for planets with R p ≤ 4 R ⊕ that serves to place powerful constraints on the formation and evolu…
View article: A Larger Sample Confirms Small Planets Around Hot Stars Are Misaligned
A Larger Sample Confirms Small Planets Around Hot Stars Are Misaligned Open
The distribution of stellar obliquities provides critical insight into the formation and evolution pathways of exoplanets. In the past decade, it was found that hot stars hosting hot Jupiters are more likely to have high obliquities than c…
View article: Peas-in-a-Pod Across the Radius Valley: Rocky Systems are Less Uniform in Mass but More Uniform in Size and Spacing
Peas-in-a-Pod Across the Radius Valley: Rocky Systems are Less Uniform in Mass but More Uniform in Size and Spacing Open
The ubiquity of "peas-in-a-pod" architectural patterns and the existence of the radius valley each present a striking population-level trend for planets with $R_{p} \leq 4 R_{\oplus}$ that serves to place powerful constraints on the format…
View article: The PFS View of TOI-677 b: A Spin–Orbit Aligned Warm Jupiter in a Dynamically Hot System*
The PFS View of TOI-677 b: A Spin–Orbit Aligned Warm Jupiter in a Dynamically Hot System* Open
TOI-677 b is part of an emerging class of “tidally detached” gas giants ( a / R ⋆ ≳ 11) that exhibit large orbital eccentricities and yet low stellar obliquities. Such sources pose a challenge for models of giant planet formation, which mu…
View article: The PFS view of TOI-677 b: A spin-orbit aligned warm Jupiter in a dynamically hot system
The PFS view of TOI-677 b: A spin-orbit aligned warm Jupiter in a dynamically hot system Open
TOI-677 b is part of an emerging class of ``tidally-detached'' gas giants ($a/R_\star \gtrsim 11$) that exhibit large orbital eccentricities and yet low stellar obliquities. Such sources pose a challenge for models of giant planet formatio…
View article: Earths Are Not Super-Earths, Saturns Are Not Jupiters: Imprints of Pressure-bump Planet Formation on Planetary Architectures
Earths Are Not Super-Earths, Saturns Are Not Jupiters: Imprints of Pressure-bump Planet Formation on Planetary Architectures Open
In protoplanetary disks, sufficiently massive planets excite pressure bumps, which can then be preferred locations for forming new planet cores. We discuss how this loop may affect the architecture of multiplanet systems and compare our pr…
View article: Earths are not Super-Earths, Saturns are not Jupiters: Imprints of pressure-bump planet formation on planetary architectures
Earths are not Super-Earths, Saturns are not Jupiters: Imprints of pressure-bump planet formation on planetary architectures Open
In protoplanetary disks, sufficiently massive planets excite pressure bumps, which can then be preferred locations for forming new planet cores. We discuss how this loop may affect the architecture of multi-planet systems, and compare our …
View article: High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID
High-resolution Transmission Spectroscopy of Ultrahot Jupiter WASP–33b with NEID Open
We report an attempt to detect molecular and atomic species in the atmosphere of the ultrahot Jupiter WASP-33b using the high-resolution echelle spectrograph NEID with a wavelength coverage of 380–930 nm. By analyzing the transmission spec…
View article: TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned
TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned Open
We report the measurement of the sky-projected obliquity angle $λ$ of the Warm Jovian exoplanet TOI-1670 c via the Rossiter-McLaughlin effect as part of the Stellar Obliquities in Long-period Exoplanet Systems (SOLES) project. We observed …