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Title:
Early science with the Large Millimetre Telescope: Deep LMT/AzTEC millimetre observations of ε Eridani and its surroundings
Authors:
Chavez-Dagostino, M.; Bertone, E.; Cruz-Saenz de Miera, F.; Marshall, J. P.; Wilson, G. W.; Sánchez-Argüelles, D.; Hughes, D. H.; Kennedy, G.; Vega, O.; De la Luz, V.; Dent, W. R. F.; Eiroa, C.; Gómez-Ruiz, A. I.; Greaves, J. S.; Lizano, S.; López-Valdivia, R.; Mamajek, E.; Montaña, A.; Olmedo, M.; Rodríguez-Montoya, I.; Schloerb, F. P.; Yun, Min S.; Zavala, J. A.; Zeballos, M.
Affiliation:
AA(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México ), AB(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AC(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AD(School of Physics, University of New South Wales, Sydney, NSW 2052, Australia; Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052, Australia), AE(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AF(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AG(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AH(Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK), AI(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AJ(SciESMEX, Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, CP 58089, México), AK(ALMA SCO, Alonso de Córdova 3107, Vitacura, Casilla 763 0355, Santiago, Chile), AL(Departamento de Física Teórica, C-XI, Facultad de Ciencias, Universidad Autónoma de Madrid, Canto Blanco E-28049, Madrid, Spain; Astro-UAM, Unidad Asociada UAM - CSIC, Madrid, Spain), AM(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AN(School of Physics and Astronomy, Cardiff University, Queen's Buildings, The Parade, Cardiff CF24 3AA, UK), AO(Instituto de Radio Astronomía y Astrofísica, Universidad Nacional Autónoma de México, Antigua Carretera a Pátzcuaro 8701, Morelia, Michoacán, CP 58089, México), AP(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AQ(Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171, USA), AR(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AS(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AT(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AU(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AV(Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA), AW(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México), AX(Instituto Nacional de Astrofísica Optica y Electrónica Luis Enrique Erro #1, CP 72840, Tonantzintla, Puebla, México)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 462, Issue 3, p.2285-2294 (MNRAS Homepage)
Publication Date:
11/2016
Origin:
OUP
Astronomy Keywords:
circumstellar matter, stars: individual: ε Eridani, submillimetre: stars
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stw1363
Bibliographic Code:
2016MNRAS.462.2285C

Abstract

ε Eridani is a nearby, young Sun-like star that hosts a ring of cool debris analogous to the Solar system's Edgeworth-Kuiper belt. Early observations at (sub-)mm wavelengths gave tentative evidence of the presence of inhomogeneities in the ring, which have been ascribed to the effect of a putative low eccentricity planet, orbiting close to the ring. The existence of these structures has been recently challenged by high-resolution interferometric millimetre observations. Here, we present the deepest single-dish image of ε Eridani at millimetre wavelengths, obtained with the Large Millimetre Telescope Alfonso Serrano (LMT). The main goal of these LMT observations is to confirm (or refute) the presence of non-axisymmetric structure in the disc. The dusty ring is detected for the first time along its full projected elliptical shape. The radial extent of the ring is not spatially resolved and shows no evidence, to within the uncertainties, of dust density enhancements. Additional features of the 1.1 mm map are: (i) the presence of significant flux in the gap between the ring and the star, probably providing the first exo-solar evidence of Poynting-Robertson drag, (ii) an unambiguous detection of emission at the stellar position with a flux significantly above that expected from ε Eridani's photosphere, and (iii) the identification of numerous unresolved sources which could correspond to background dusty star-forming galaxies.
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