ESO/HARPS Archives

Star: HD127423, Spectral Type:G0V, Observation Date/Time: 2013-06-01, 04:16:19.375. Top panel: reduced spectrum. Bottom panel: subsection of the corresponding CCD image for this wavelength range. -- astro-ph.IM

AI - Data - Apps - Cybernetics, Astronomy & Telescopes, SETI & Technosignatures, Status Report

A 2821 Star Optical SETI Survey Using ESO HARPS Archival Data

by Keith CowingAugust 13, 2025August 13, 2025

We examined archived observations of 2,821 stars taken by the high-resolution ESO HARPS spectrograph to search for potential narrow-band laser emissions from extraterrestrial sources.

NCORES observed planets in orbital period - planet radius (left) and orbital period - planet mass (right). Confirmed planets are shown in purple and null results in orange. Planets detected in the radial velocities only and plotted with their 𝑀𝑝 sin 𝑖 values and shown in blue. A Gaussian kernel density estimate showing the background population of planets from the NASA Exoplanet Archive is shown in green. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Status Report

The NCORES Program: Precise Planetary Masses, Null Results, and Insight Into The Planet Mass Distribution Near The Radius Gap

by Keith CowingJanuary 27, 2025September 18, 2025

NCORES was a large observing program on the ESO HARPS spectrograph, dedicated to measuring the masses of Neptune-like and smaller transiting planets discovered by the TESS satellite using the radial […]

RVs over time for the best model (1P(5 d-ecc) + dSHO-GP28 d) fitted to the HARPS (top) and CARMENES (bottom) RVs of GJ 724. The GP component of the model is plotted as the orange solid line. The black lines show the median of 10 000 samples from the posterior and the grey shaded areas denote the 68 %, 95 %, and 99 % confidence intervals, respectively. Instrumental RV offsets were subtracted from the measurements and the model, and the error bars include the jitter added in quadrature. The residuals after subtracting the median model are shown in the lower panel. -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Planetary Companions Orbiting The M Dwarfs GJ 724 And GJ 3988. A CARMENES And IRD Collaboration

by Keith CowingOctober 10, 2023October 10, 2023

We report the discovery of two exoplanets around the M dwarfs GJ 724 and GJ 3988 using the radial velocity (RV) method. We obtained a total of 153 3.5 m […]