A Preponderance of Perpendicular Planets

@article{Albrecht2021APO,
  title={A Preponderance of Perpendicular Planets},
  author={Simon H. Albrecht and Marcus L. Marcussen and Joshua N. Winn and Rebekah I. Dawson and Emil Knudstrup},
  journal={The Astrophysical Journal Letters},
  year={2021},
  volume={916}
}
Observing the Rossiter–McLaughlin effect during a planetary transit allows the determination of the angle λ between the sky projections of the star’s spin axis and the planet’s orbital axis. Such observations have revealed a large population of well-aligned systems and a smaller population of misaligned systems, with values of λ ranging up to 180°. For a subset of 57 systems, we can now go beyond the sky projection and determine the 3D obliquity ψ by combining the Rossiter–McLaughlin data with… 

The Warm Neptune GJ 3470b Has a Polar Orbit

The warm Neptune GJ 3470b transits a nearby (d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two transits with the newly commissioned NEID spectrometer on

Tidal Erasure of Stellar Obliquities Constrains the Timing of Hot Jupiter Formation

Stars with hot Jupiters sometimes have high obliquities, which are possible relics of hot Jupiter formation. Based on the characteristics of systems with and without high obliquities, it is suspected

Stellar Obliquities in Exoplanetary Systems

The rotation of a star and the revolutions of its planets are not necessarily aligned. This article reviews the measurement techniques, key findings, and theoretical interpretations related to the

HighSpec: a novel high-resolution narrow band-pass spectrograph

We present HighSpec – a spectrograph designed for the Multi-Aperture-Spectroscopic Telescope (MAST). HighSpec’s novel optical setup achieves high spectral resolution of R ∼ 20, 000, while maintaining

A Tendency Toward Alignment in Single-star Warm-Jupiter Systems

The distribution of spin–orbit angles for systems with wide-separation, tidally detached exoplanets offers a unique constraint on the prevalence of dynamically violent planetary evolution histories.

Analytic model for photometric variation due to starspots on a differentially rotating star

We present an analytic model of the light-curve variation for stars with non-evolving starspots on a differentially rotating surface. The Fourier coefficients of the harmonics of the rotation

Evidence for the Late Arrival of Hot Jupiters in Systems with High Host-star Obliquities

It has been shown that hot Jupiters systems with massive, hot stellar primaries exhibit a wide range of stellar obliquities. On the other hand, hot Jupiter systems with low-mass, cool primaries often

The Habitable Zones of Rapidly Rotating Main Sequence A/F Stars

We investigate how rapid stellar rotation commonly seen in A/F stars can influence planet habitability. Specifically, we model how rapid rotation influences a planet’s irradiation and determine the

Stellar Companions to TESS Objects of Interest: A Test of Planet–Companion Alignment

We present a catalog of stellar companions to host stars of Transiting Exoplanet Survey Satellite Objects of Interest (TOIs) identified from a marginalized likelihood ratio test that incorporates

TOI-3714 b and TOI-3629 b: Two Gas Giants Transiting M Dwarfs Confirmed with the Habitable-zone Planet Finder and NEID

We confirm the planetary nature of two gas giants discovered by the Transiting Exoplanet Survey Satellite to transit M dwarfs. TOI-3714 (V = 15.24, J = 11.74) is an M2 dwarf hosting a hot Jupiter (M

References

SHOWING 1-10 OF 90 REFERENCES

A backward-spinning star with two coplanar planets

TLDR
The K2-290 system is shown to be the best-known candidate for a primordial misalignment star in a coplanar multiplanet system and provides the clearest demonstration that stars and protoplanetary disks can become grossly misaligned due to the gravitational torque from a neighboring star.

On a Possible Solution to the Tidal Realignment Problem for Hot Jupiters

TLDR
The model implies that hot Jupiters orbiting cool stars are probably not in immediate danger of being devoured by their host stars while they are on the main sequence, and a testable prediction of the model is that hot Jupiter hosts with orbital periods shorter than 2–3 days should have obliquities much smaller than 1°.

The TESS–Keck Survey. IV. A Retrograde, Polar Orbit for the Ultra-low-density, Hot Super-Neptune WASP-107b

We measured the Rossiter–McLaughlin effect of WASP-107b during a single transit with Keck/HIRES. We found the sky-projected inclination of WASP-107b’s orbit, relative to its host star’s rotation

3D MHD simulations of accretion on to stars with tilted magnetic and rotational axes

We present results of global three-dimensional (3D) magnetohydrodynamic (MHD) simulations of the accretion onto a magnetized star where both the magnetic and rotational axes of the star are tilted

Hot Stars with Kepler Planets Have High Obliquities

It has been known for a decade that hot stars with hot Jupiters tend to have high obliquities. Less is known about the degree of spin–orbit alignment for hot stars with other kinds of planets. Here,

Broadband transmission spectroscopy of HD 209458b with ESPRESSO: evidence for Na, TiO, or both

Context. The detection and characterization of exoplanet atmospheres is currently one of the main drivers pushing the development of new observing facilities. In this context, high-resolution

The hot dayside and asymmetric transit of WASP-189 b seen by CHEOPS

The CHEOPS space mission dedicated to exoplanet follow-up was launched in December 2019, equipped with the capacity to perform photometric measurements at the 20 ppm level. As CHEOPS carries out its

The TESS-Keck Survey. III. A Stellar Obliquity Measurement of TOI-1726 c

We report the measurement of a spectroscopic transit of TOI-1726c, one of two planets transiting a G-type star with V = 6.9 in the Ursa Major Moving Group (∼400 Myr). With a precise age constraint

A Disk-driven Resonance as the Origin of High Inclinations of Close-in Planets

The recent characterization of transiting close-in planets has revealed an intriguing population of sub-Neptunes with highly tilted and even polar orbits relative to their host star’s equator. Any

The Habitable Zone Planet Finder Reveals a High Mass and Low Obliquity for the Young Neptune K2-25b

Using radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600–800 Myr
...