[en] SPECULOOS (Search for habitable Planets EClipsing ULtra-cOOl Stars) aims to perform a transit search on the nearest (< 40 pc) ultracool (< 3000K) dwarf stars. The project's main motivation is to discover potentially habitable planets well-suited for detailed atmospheric characterisation with upcoming giant telescopes, like the James Webb Space Telescope (JWST) and European Large Telescope (ELT). The project is based on a network of 1m robotic telescopes, namely the four ones of the SPECULOOS-Southern Observatory (SSO) in Cerro Paranal, Chile, one telescope of the SPECULOOS-Northern Observatory (SNO) in Tenerife, and the SAINTEx telescope in San Pedro Martir, Mexico. The prototype survey of the SPECULOOS project on the 60 cm TRAPPIST telescope (Chile) discovered the TRAPPIST-1 system, composed of seven temperate Earth-sized planets orbiting a nearby (12 pc) Jupiter-sized star. In this paper, we review the current status of SPECULOOS, its first results, the plans for its development, and its connection to the Transiting Exoplanet Survey Satellite (TESS) and JWST.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sebastian, Daniel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Pedersen, P. P.; Univ. of Cambridge (United Kingdom)
Murray, C. A.; Univ. of Cambridge (United Kingdom)
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Garcia, Lionel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Burdanov, A.; Massachusetts Institute of Technology (United States)
Pozuelos, F. J.; Liège Univ. (Belgium)
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Wells, R.; Univ. Bern (Switzerland)
Dransfield, G.; Univ. of Birmingham (United Kingdom)
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Demory, B.-O.; Univ. Bern (Switzerland)
Queloz, D.; Univ. of Cambridge (United Kingdom)
Triaud, A. H. M. J.; Univ. of Birmingham (United Kingdom)
De Witt, J.; Massachusetts Institute of Technology (United States)
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Gómez Maqueo Chew, Y.; Univ. Nacional Autónoma de México (Mexico)
Günther, M. N.; Massachusetts Institute of Technology (United States)
Niraula, P.; Massachusetts Institute of Technology (United States)
Rackham, B. V.; Massachusetts Institute of Technology (United States)
Schanche, N.; Univ. Bern (Switzerland)
Sohy, Sandrine ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Thompson, S.; Univ. of Cambridge (United Kingdom))
Madhusudhan, N. Exoplanetary Atmospheres: Key Insights, Challenges, and Prospects. 57, 617-663 (2019). 1904.03190.
Charbonneau, D. et al. A super-Earth transiting a nearby low-mass star. 462, 891-894 (2009). 0912.3229.
Tsiaras, A., Waldmann, I. P., Tinetti, G., Tennyson, J. & Yurchenko, S. N. Author Correction: Water vapour in the atmosphere of the habitable-zone eight-Earth-mass planet K2-18 b. Nature Astronomy 3, 1156-1156 (2019).
Benneke, B. et al. Water Vapor and Clouds on the Habitable-zone Sub-Neptune Exoplanet K2-18b. 887, L14 (2019). 1909.04642.
Kaltenegger, L. & Traub, W. A. Transits of Earth-like Planets. The Astrophysical Journal 698, 519-527 (2009). 0903.3371.
de Wit, J. & Seager, S. Constraining Exoplanet Mass from Transmission Spectroscopy. Science 342, 1473-1477 (2013). 1401.6181.
Morley, C. V., Kreidberg, L., Rustamkulov, Z., Robinson, T. & Fortney, J. J. Observing the Atmospheres of Known Temperate Earth-sized Planets with JWST. The Astrophysical Journal 850, 121 (2017). 1708. 04239.
Muirhead, P. S. et al. CHARACTERIZING THE COOL KOIs. III. KOI 961: A SMALL STAR WITH LARGE PROPER MOTION AND THREE SMALL PLANETS. The Astrophysical Journal 747, 144 (2012). URL https://doi.org/10.1088%2F0004-637x%2F747%2F2%2F144.
Nutzman, P. & Charbonneau, D. Design Considerations for a Ground-Based Transit Search for Habitable Planets Orbiting M Dwarfs. Publications of the Astronomical Society of the Pacić 120, 317 (2008). 0709. 2879.
Berta-Thompson, Z. K. et al. A rocky planet transiting a nearby low-mass star. 527, 204-207 (2015). 1511.03550.
Dittmann, J. A. et al. A temperate rocky super-Earth transiting a nearby cool star. 544, 333-336 (2017). 1704.05556.
Ment, K. et al. A Second Terrestrial Planet Orbiting the Nearby M Dwarf LHS 1140. 157, 32 (2019). 1808.00485.
Ricker, G. R. et al. Transiting Exoplanet Survey Satellite (TESS). Journal of Astronomical Telescopes, Instruments, and Systems 1, 014003 (2015).
Crossfield, I. J. M. et al. A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18. 883, L16 (2019). 1906.09267.
Vanderspek, R. et al. TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844. The Astrophysical Journal Letters 871, L24 (2019). 1809.07242.
Ment, K. et al. Toi 540 b: A planet smaller than earth orbiting a nearby rapidly rotating low-mass star. arXiv e-prints arXiv:2009.13623 (2020). URL https://ui.adsabs.harvard.edu/abs/2020arXiv200913623M. 2009.13623.
Howard, A. W. et al. Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler. 201, 15 (2012). 1103.2541.
Hardegree-Ullman, K. K., Cushing, M. C., Muirhead, P. S. & Christiansen, J. L. Kepler Planet Occurrence Rates for Mid-type M Dwarfs as a Function of Spectral Type. 158, 75 (2019). 1905.05900.
Kirkpatrick, J. D., Henry, T. J. & Irwin, M. J. Ultra-Cool M Dwarfs Discovered by QSO Surveys.I: The APM Objects. 113, 1421-1428 (1997).
Kirkpatrick, J. D. New Spectral Types L and T. 43, 195-245 (2005).
Sullivan, P. W. et al. The Transiting Exoplanet Survey Satellite: Simulations of Planet Detections and Astrophysical False Positives. The Astrophysical Journal 809, 77 (2015). 1506.03845.
Barclay, T., Pepper, J. & Quintana, E. V. A Revised Exoplanet Yield from the Transiting Exoplanet Survey Satellite (TESS). 239, 2 (2018). 1804.05050.
Gillon, M. et al. Temperate Earth-sized planets transiting a nearby ultracool dwarf star. Nature 533, 221-224 (2016). 1605.07211.
Gillon, M. et al. Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1. Nature 542, 456-460 (2017). URL https://doi.org/10.1038/nature21360.
Luger, R. et al. A seven-planet resonant chain in TRAPPIST-1. Nature Astronomy 1 (2017). URL https://doi.org/10.1038/s41550-017-0129.
Lustig-Yaeger, J., Meadows, V. S. & Lincowski, A. P. The Detectability and Characterization of the TRAPPIST-1 Exoplanet Atmospheres with JWST. The Astronomical Journal 158, 27 (2019). 1905.07070.
Macdonald, E. J. R. & Cowan, N. B. An empirical infrared transit spectrum of Earth: opacity windows and biosignatures. arXiv e-prints arXiv:1908.10873 (2019). 1908.10873.
Demory, B.-O., Gillon, M., Madhusudhan, N. & Queloz, D. Variability in the super-Earth 55 Cnc e. Monthly Notices of the Royal Astronomical Society 455, 2018-2027 (2016). 1505.00269.
He, M. Y., Triaud, A. H. M. J. & Gillon, M. First limits on the occurrence rate of short-period planets orbiting brown dwarfs. 464, 2687-2697 (2017). 1609.05053.
Sagear, S. A., Skinner, J. N. & Muirhead, P. S. Upper Limits on Planet Occurrence around Ultracool Dwarfs with K2. arXiv e-prints arXiv:1912.04286 (2019). 1912.04286.
Lienhard, F. et al. Global analysis of the TRAPPIST Ultra-Cool Dwarf Transit Survey. 497, 3790-3808 (2020). 2007.07278.
Payne, M. J. & Lodato, G. The potential for Earth-mass planet formation around brown dwarfs. 381, 1597-1606 (2007). 0709.0676.
Raymond, S. Formation and Stability of "Hot Earth" Planets. In American Astronomical Society Meeting Abstracts #210, vol. 210 of American Astronomical Society Meeting Abstracts, 110.03 (2007).
Lissauer, J. J. Planets Formed in Habitable Zones of M Dwarf Stars Probably Are Dećient in Volatiles. 660, L149-L152 (2007). astro-ph/0703576.
Montgomery, R. & Laughlin, G. Formation and detection of Earth mass planets around low mass stars. 202, 1-11 (2009). 0903.2452.
Alibert, Y. & Benz, W. Formation and composition of planets around very low mass stars. 598, L5 (2017). 1610.03460.
Coleman, G. A. L., Leleu, A., Alibert, Y. & Benz, W. Pebbles versus planetesimals: the case of Trappist-1. 631, A7 (2019). 1908.04166.
Schoonenberg, D., Liu, B., Ormel, C. W. & Dorn, C. Pebble-driven planet formation for TRAPPIST-1 and other compact systems. 627, A149 (2019). 1906.00669.
Miguel, Y., Cridland, A., Ormel, C. W., Fortney, J. J. & Ida, S. Diverse outcomes of planet formation and composition around low-mass stars and brown dwarfs. 491, 1998-2009 (2020). 1909.12320.
Liu, B., Lambrechts, M., Johansen, A., Pascucci, I. & Henning, T. Pebble-driven planet formation around very low-mass stars and brown dwarfs. 638, A88 (2020). 2004.07239.
Gillon, M., Jehin, E., Fumel, A., Magain, P. & Queloz, D. TRAPPIST-UCDTS: A prototype search for habitable planets transiting ultra-cool stars. In European Physical Journal Web of Conferences, vol. 47 of European Physical Journal Web of Conferences, 03001 (2013).
Burdanov, A., Delrez, L., Gillon, M. & Jehin, E. SPECULOOS Exoplanet Search and Its Prototype on TRAPPIST, 130 (2018).
Delrez, L. et al. SPECULOOS: a network of robotic telescopes to hunt for terrestrial planets around the nearest ultracool dwarfs. In Proceedings of the SPIE, vol. 10700 of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 107001I (2018). 1806.11205.
Gillon, M. Searching for red worlds. Nature Astronomy 2, 344-344 (2018).
Jehin, E. et al. The SPECULOOS Southern Observatory Begins its Hunt for Rocky Planets. The Messenger 174, 2-7 (2018).
Murray, C. A. et al. Photometry and performance of SPECULOOS-South. 495, 2446-2457 (2020). 2005.02423.
Niraula, P. et al. A earth: A 3.14 day earth-sized planet from k2's kitchen served warm by the speculoos team. 160, 172 (2020). URL https://ui.adsabs.harvard.edu/abs/2020AJ....160..172N. 2006.07308.
Demory, B. O. et al. A super-earth and a sub-neptune orbiting the bright, quiet m3 dwarf toi-1266. 642, A49 (2020). URL https://ui.adsabs.harvard.edu/abs/2020A&A...642A..49D. 2009.04317.
Gillon, M. et al. TRAPPIST: a robotic telescope dedicated to the study of planetary systems. In European Physical Journal Web of Conferences, vol. 11 of European Physical Journal Web of Conferences, 06002 (2011). 1101.5807.
Jehin, E. et al. TRAPPIST: TRAnsiting Planets and PlanetesImals Small Telescope. The Messenger 145, 2-6 (2011).
Sebastian, D. et al. Speculoos-ultracool dwarf transit survey: Target list and strategy. arXiv e-prints arXiv:2011.02069 (2020). URL https://ui.adsabs.harvard.edu/abs/2020arXiv201102069S. 2011.02069.
Gaia Collaboration et al. The Gaia mission. Astronomy and Astrophysics 595, A1 (2016). 1609.04153.
Gaia Collaboration et al. Gaia Data Release 2. Summary of the contents and survey properties. Astronomy and Astrophysics 616, A1 (2018). 1804.09365.
Skrutskie, M. F. et al. The Two Micron All Sky Survey (2MASS). The Astronomical Journal 131, 1163-1183 (2006).
Kopparapu, R. K. et al. Habitable Zones around Main-sequence Stars: New Estimates. 765, 131 (2013). 1301.6674.
Tamburo, P. & Muirhead, P. S. Design Considerations for a Ground-based Search for Transiting Planets around L and T Dwarfs. 131, 114401 (2019). 1908.03593.
Gibbs, A. et al. EDEN: Sensitivity Analysis and Transiting Planet Detection Limits for Nearby Late Red Dwarfs. 159, 169 (2020). 2002.10017.
Morris, B. M. et al. astroplan: An Open Source Observation Planning Package in Python. 155, 128 (2018). 1712.09631.
Wheatley, P. J. et al. The Next Generation Transit Survey (NGTS). 475, 4476-4493 (2018). 1710.11100.
Irwin, M. J. et al. VISTA data ow system: pipeline processing for WFCAM and VISTA. In Quinn, P. J. & Bridger, A. (eds.) Optimizing Scientić Return for Astronomy through Information Technologies, vol. 5493 of , 411-422 (2004).
Lang, D., Hogg, D. W., Mierle, K., Blanton, M. & Roweis, S. Astrometry.net: Blind Astrometric Calibration of Arbitrary Astronomical Images. 139, 1782-1800 (2010). 0910.2233.
Bradley, L. et al. astropy/photutils: v0.7.2 (2019).
Newville, M., Stensitzki, T., Allen, D. B. & Ingargiola, A. LMFIT: Non-Linear Least-Square Minimization and Curve-Fitting for Python (2014).
Astropy Collaboration et al. Astropy: A community Python package for astronomy. 558, A33 (2013). 1307.6212.
Astropy Collaboration et al. The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package. 156, 123 (2018). 1801.02634.
Bailey, S. Principal Component Analysis with Noisy and/or Missing Data. 124, 1015 (2012). 1208.4122.
Castro-Almazan, J. A. et al. Precipitable Water Vapour at the Canarian Observatories (Teide and Roque de los Muchachos) from routine GPS. In Peck, A. B., Seaman, R. L. & Benn, C. R. (eds.) Observatory Operations: Strategies, Processes, and Systems VI, vol. 9910 of Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series, 99100P (2016).
Kerber, F. et al. A water vapour monitor at Paranal Observatory. In McLean, I. S., Ramsay, S. K. & Takami, H. (eds.) Ground-based and Airborne Instrumentation for Astronomy IV, vol. 8446 of , 84463N (2012).
Jones, A., Noll, S., Kausch, W., Szyszka, C. & Kimeswenger, S. An advanced scattered moonlight model for Cerro Paranal. 560, A91 (2013). 1310.7030.
Noll, S. et al. An atmospheric radiation model for Cerro Paranal. I. The optical spectral range. 543, A92 (2012). 1205.2003.
Husser, T.-O. et al. A new extensive library of PHOENIX stellar atmospheres and synthetic spectra. 553, A6 (2013). 1303.5632.
Pedersen, P. P. et al. A photometric correction for precipitable water vapour. in prep. (2021).
Murray, C. A. et al. Study of Flares in the Ultra-Cool Regime from SPECULOOS-South. in prep. (2021).
Mahlke, M. et al. The ssos pipeline: Identićation of Solar System objects in astronomical images. Astron-omy and Computing 28, 100289 (2019). 1906.03673.
Mommert, M. PHOTOMETRYPIPELINE: An automated pipeline for calibrated photometry. Astronomy and Computing 18, 47-53 (2017). 1702.00834.
Marciniak, A. et al. Against the biases in spins and shapes of asteroids. 118, 256-266 (2015). 1711.02429.
Monteiro, F., Silva, J. S., Tamayo, F., Rodrigues, T. & Lazzaro, D. Shape model and spin direction analysis of PHA (436724) 2011 UW158: a large superfast rotator. 495, 3990-4005 (2020).
Margot, J. L., Pravec, P., Taylor, P., Carry, B. & Jacobson, S. Asteroid Systems: Binaries, Triples, and Pairs, 355-374 (2015).
Kaasalainen, M., Mottola, S. & Fulchignoni, M. Asteroid Models from Disk-integrated Data, 139-150 (2002).
Kostov, V. B. et al. The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M Dwarf. 158, 32 (2019). 1903.08017.
Triaud, A. H. M. J. et al. An eclipsing substellar binary in a young triple system discovered by SPECULOOS. Nature Astronomy (2020). 2001.07175.
Günther, M. N. et al. Complex modulation of rapidly rotating young m dwarfs: Adding pieces to the puzzle. arXiv e-prints arXiv:2008.11681 (2020). URL https://ui.adsabs.harvard.edu/abs/2020arXiv200811681G. 2008.11681.
von Boetticher, A. et al. The eblm project. v. physical properties of ten fully convective, very-low-mass stars. 625, A150 (2019). URL https://ui.adsabs.harvard.edu/abs/2019A&A...625A.150V. 1903.10808.