Génesis

Ref. PID2019-105203GB-C22 Dates: June 2020 / June 2024 Project PI: Carmen Sánchez Contreras

GENESIS is coordinated with the proyect “Pérdida de masa, envolturas circunestelares, y el rol de las binarias en estrellas evolucionadas – EVENTs“, (PID2019-105203GB-C21), PI: J. Alcolea (OAN, Spain) y V. Bujarrabal (OAN, Spain).

Our more general objective is to study the physical and chemical properties of gas and dust envelopes around evolved low- and intermediate-mass stars in the red giant phase (AGB) and beyond, both in the planetary nebula (PN) stage and in the transition phase between the two (called post-AGB or pre-PN). We aim to advance in the identification of the processes responsible for the morphological, dynamical and chemical changes induced in the circumstellar material during the short transition stage from AGB to PN. Our research is based on multi-wavelength observations obtained with first-line telescopes (such as ALMA, HST, Herschel, GTC, etc) and on an extensive and detailed analysis of these observations (e.g. using radiative transfer codes developed in the group).

Developements:

IDEATE  — https://github.com/dmcarmen/ideate

Other members of the team: 

José Pablo Fonfría Expósito. Postdoctoral researcher from 16 July 2022.

Jaime Alonso Hernández: PhD student since May 2022 (INTA fellowship). Thesis’ Subject: “Binarity in AGB stars: impact on nebular physics and chemistry”.

Carmen Díez Menéndez (Oct 2021 – June 2022) CSIC JAE-INTRO fellow (Ref. JAEINT_21_02510). Bachelor’s thesis on Informatics Engineering. Title: “IDEATE: herramienta de interacción entre el programa de modelado físico 3D ShapeX y códigos de transferencia radiativa aplicados a envolturas circunestelares”. University: Escuela Politécnica Superior (U. Autónoma de Madrid).

Ramón Rodríguez Cardoso (Oct 2020 – Sept 2021) Final Master’s thesis on Astrophysics. Title: “Discovery and characterization of a rotating equatorial structure at the core of OH 231.8+4.2”. University: Facultad de Ciencias Físicas (U. Complutense de Madrid).

The Calabash Nebula, pictured here — which has the technical name OH 231.84 +4.22 — is a spectacular example of the death of a low-mass star like the Sun. This image taken by the NASA/ESA Hubble Space Telescope shows the star going through a rapid transformation from a red giant to a planetary nebula, during which it blows its outer layers of gas and dust out into the surrounding space. The recently ejected material is spat out in opposite directions with immense speed — the gas shown in yellow is moving close to a million kilometres an hour. Astronomers rarely capture a star in this phase of its evolution because it occurs within the blink of an eye — in astronomical terms. Over the next thousand years the nebula is expected to evolve into a fully fledged planetary nebula. The nebula is also known as the Rotten Egg Nebula because it contains a lot of sulphur, an element that, when combined with other elements, smells like a rotten egg — but luckily, it resides over 5000 light-years away in the constellation of Puppis (The Poop deck). By ESA/Hubble, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=55585601

Related news

The dramatic final dance of the stars with a common envelope

Related publications

Observational identification of a sample of likely recent common-envelope events
READ MORE >>
Dissecting the central regions of OH 231.8 + 4.2 with ALMA: a salty rotating disk at the base of a young bipolar outflow (aceptado)
READ MORE >>
M1-92 revisited: new findings and open questions. New NOEMA observations of Minkowski’s Footprint
READ MORE >>

Team

Astrophysics Department
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Astrophysics Department
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Astrophysics Department
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