Max Planck Institute for Astronomy

Constraints on Horndeski Gravity with Phantom Crossing

Abstract Gravity models in which the dark energy equation of state crosses w = −1, also known as the phantom divide, have received extensive interest due to recent analyses favouring this behaviour. We introduce a new subclass of Horndeski scalar-tensor models capable of generati...

Shadows cast by precessing annuli as evidence for an inclined planet in HD 139614

Abstract We analyse scattered-light images at multiple epochs of the protoplanetary disc HD 139614 taken with GPI and SPHERE instruments. We show that the azimuthal distribution of the surface brightness of the inner bright ring (13 − 21 au) varies with time (likely caused by a s...

Embodied Cognition in Science Teacher Education: A Phenomenographic Analysis of Science Teachers’ Experiences When Using Role-play to Engage with Different Philosophical Traditions of Embodiment

Abstract Embodied cognition (EC) theory has become increasingly prevalent in k-10 science education but remains largely theoretical or divorced from authentic classroom practices. We address this gap in the literature by examining how EC can be systematically brought into science...

Discovery of a Compact Hub-Filament System in G286.21+0.17 with JWST and ALMA: Insights into Protocluster Formation and Competitive Accretion

Abstract We present a multi-wavelength study of the massive protocluster G286.21+0.17 (G286) using JWST near-infrared (NIR) imaging and ALMA H13CO+(1–0) observations. The JWST images uncover a compact (∼0.5 pc) hub-filament system (HFS), comprising a dense central hub connected b...

Dust Substructures and Line Perturbations driven by a Forming Planet in J16120

Abstract Hints of planet formation have been independently reported within the gap of the disc around 2MASS J16120668-301027 from millimetre continuum, infrared, and Hα observations. In this work, we present new evidence for ongoing planet formation based on Atacama Large Millime...

Little Red Dots host Black Hole Stars: A unified family of gas-reddened AGN revealed by JWST/NIRSpec spectroscopy

Abstract We construct and characterise a sample of 146 little red dots (LRDs) across 2.0 < z < 9.3, selecting all sources with v-shaped UV-optical continua from JWST NIRSpec/PRISM spectra and compact morphologies in NIRCam/F444W imaging. We show that LRD continuum spectra are wel...

STARSFLUX: an all-sky catalogue of absolute spectro-photometric calibrators from 0.3 to 30 μ m

Abstract Obtaining accurate fluxes of faint sources from the ground in near- and mid-infrared wavelengths is challenging because of the rapidly changing atmospheric absorption. A common limitation is the lack of a nearby spectro-photometric calibrator. We present the STellar Abso...