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# Rotational broadening of exoplanet spectra in arbitrarily oriented systems: Application to reflected light

## Details

**Authors** Vaughan et al.

**Year** 2026

**Publisher** Astronomy & Astrophysics

**Discipline** Astronomy

[Read it at the publisher](https://doi.org/10.1051/0004-6361/202661714) 
10.1051/0004-6361/202661714

## In authors' words

### What they found (results)

Deriving rotational-broadening kernels for arbitrarily oriented star-planet systems, the authors find the reflected-light spectrum of a non-aligned system's broadening differs from a prograde-aligned system's by roughly 50%.

## Commentary

### In short

The same physical planet yields a substantially different measured signal purely as a function of the geometric vantage point from which it is observed, with the broadening kernel coupled to that orientation.

**Patterns it shows** R, P

**Added** 2026-09-08

**How to cite this** Vaughan et al. (2026). Rotational broadening of exoplanet spectra in arbitrarily oriented systems: Application to reflected light. Astronomy & Astrophysics.