PDRs4All: A JWST Early Release Science Program on Radiative Feedback from Massive Stars
Authors: Berné Olivier , Habart Émilie , Peeters Els , Abergel Alain , Bergin Edwin A. , Bernard-Salas Jeronimo , Bron Emeric , Cami Jan , Dartois Emmanuel , Fuente Asunción , Goicoechea Javier R. , Gordon Karl D. , Okada Yoko , Onaka Takashi , Robberto Massimo , Röllig Markus , Tielens Alexander G. G. M. , Vicente Sílvia , Wolfire Mark G. , Alarcón Felipe , Boersma C. , Canin Amélie , Chown Ryan , Dicken Daniel , Languignon David , Le Gal Romane , Pound Marc W. , Trahin Boris , Simmer Thomas , Sidhu Ameek , Van De Putte Dries , Cuadrado Sara , Guilloteau Claire , Maragkoudakis Alexandros , Schefter Bethany R. , Schirmer Thiébaut , Cazaux Stéphanie , Aleman Isabel , Allamandola Louis , Auchettl Rebecca , Antonio Baratta Giuseppe , Bejaoui Salma , Bera Partha P. , Bilalbegović Goranka , Black John H. , Boulanger Francois , Bouwman Jordy , Brandl Bernhard , Brechignac Philippe , Brünken Sandra , Burkhardt Andrew , Candian Alessandra , Cernicharo Jose , Chabot Marin , Chakraborty Shubhadip , Champion Jason , Colgan Sean W. J. , Cooke Ilsa R. , Coutens Audrey , Cox Nick L. J. , Demyk Karine , Donovan Meyer Jennifer , Engrand Cécile , Foschino Sacha , García-Lario Pedro , Gavilan Lisseth , Gerin Maryvonne , Godard Marie , Gottlieb Carl A. , Guillard Pierre , Gusdorf Antoine , Hartigan Patrick , He Jinhua , Herbst Eric , Hornekaer Liv , Jäger Cornelia , Janot-Pacheco Eduardo , Joblin Christine , Kaufman Michael , Kemper Francisca , Kendrew Sarah , Kirsanova Maria S. , Klaassen Pamela , Knight Collin , Kwok Sun , Labiano Álvaro , Lai Thomas S.-Y. , Lee Timothy J. , Lefloch Bertrand , Le Petit Franck , Li Aigen , Linz Hendrik , Mackie Cameron J. , Madden Suzanne C. , Mascetti Joëlle , McGuire Brett A. , Merino Pablo , Micelotta Elisabetta R. , Misselt Karl , Morse Jon A. , Mulas Giacomo , Neelamkodan Naslim , Ohsawa Ryou , Omont Alain , Paladini Roberta , Elisabetta Palumbo Maria , Pathak Amit , Pendleton Yvonne J. , Petrignani Annemieke , Pino Thomas , Puga Elena , Rangwala Naseem , Rapacioli Mathias , Ricca Alessandra , Roman-Duval Julia , Roser Joseph , Roueff Evelyne , Rouillé Gaël , Salama Farid , Sales Dinalva A. , Sandstrom Karin , Sarre Peter , Sciamma-O’Brien Ella , Sellgren Kris , Shannon Matthew J. , Shenoy Sachindev S. , Teyssier David , Thomas Richard D. , Togi Aditya , Verstraete Laurent , Witt Adolf N. , Wootten Alwyn , Ysard Nathalie , Zettergren Henning , Zhang Yong , Zhang Ziwei E. , Zhen Junfeng 
Published: June 2022

Abstract
Massive stars disrupt their natal molecular cloud material through radiative and mechanical feedback processes. These processes have profound effects on the evolution of interstellar matter in our Galaxy and throughout the universe, from the era of vigorous star formation at redshifts of 1–3 to the present day. The dominant feedback processes can be probed by observations of the Photo-Dissociation Regions (PDRs) where the far-ultraviolet photons of massive stars create warm regions of gas and dust in the neutral atomic and molecular gas. PDR emission provides a unique tool to study in detail the physical and chemical processes that are relevant for most of the mass in inter- and circumstellar media including diffuse clouds, proto-planetary disks, and molecular cloud surfaces, globules, planetary nebulae, and star-forming regions. PDR emission dominates the infrared (IR) spectra of star-forming galaxies. Most of the Galactic and extragalactic observations obtained with the James Webb Space Telescope (JWST) will therefore arise in PDR emission. In this paper we present an Early Release Science program using the MIRI, NIRSpec, and NIRCam instruments dedicated to the observations of an emblematic and nearby PDR: the Orion Bar. These early JWST observations will provide template data sets designed to identify key PDR characteristics in JWST observations. These data will serve to benchmark PDR models and extend them into the JWST era. We also present the Science-Enabling products that we will provide to the community. These template data sets and Science-Enabling products will guide the preparation of future proposals on star-forming regions in our Galaxy and beyond and will facilitate data analysis and interpretation of forthcoming JWST observations.