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The PDS 110 observing campaign – photometric and spectroscopic observations reveal eclipses are aperiodic

Osborn, HP; Kenworthy, M; Rodriguez, JE; de Mooij, EJW; Kennedy, GM; Relles, H; Gomez, E; Hippke, M; Banfi, M; Barbieri, L; Becker, IS; Benni, P; Berlind, P; Bieryla, A; Bonnoli, G; Boussier, H; Brincat, SM; Briol, J; Burleigh, MR; Butterley, T; Calkins, ML; Chote, P; Ciceri, S; Deldem, M; Dhillon, VS; Dose, E; Dubois, F; Dvorak, S; Esquerdo, GA; Evans, DF; Ferratfiat, S; Fossey, SJ; Günther, MN; Hall, J; Hambsch, F-J; Herrero, E; Hills, K; James, R; Jayawardhana, R; Kafka, S; Killestein, TL; Kotnik, C; Latham, DW; Lemay, D; Lewin, P; Littlefair, S; Lopresti, C; Mallonn, M; Mancini, L; Marchini, A; McCormac, JJ; Murawski, G; Myers, G; Papini, R; Popov, V; Quadri, U; Quinn, SN; Raynard, L; Rizzuti, L; Robertson, J; Salvaggio, F; Scholz, A; Sfair, R; Smith, AMS; Southworth, J; Tan, TG; Vanaverbeke, S; Waagen, EO; Watson, CA; West, RG; Winter, OC; Wheatley, PJ; Wilson, RW; Zhou, G

The PDS 110 observing campaign – photometric and spectroscopic observations reveal eclipses are aperiodic Thumbnail


HP Osborn

M Kenworthy

JE Rodriguez

EJW de Mooij

GM Kennedy

H Relles

E Gomez

M Hippke

M Banfi

L Barbieri

IS Becker

P Benni

P Berlind

A Bieryla

G Bonnoli

H Boussier

SM Brincat

J Briol

MR Burleigh

ML Calkins

P Chote

S Ciceri

M Deldem

VS Dhillon

E Dose

F Dubois

S Dvorak

GA Esquerdo

DF Evans

S Ferratfiat

SJ Fossey

MN Günther

J Hall

F-J Hambsch

E Herrero

K Hills

R James

R Jayawardhana

S Kafka

TL Killestein

C Kotnik

DW Latham

D Lemay

P Lewin

S Littlefair

C Lopresti

M Mallonn

L Mancini

A Marchini

JJ McCormac

G Murawski

G Myers

R Papini

V Popov

U Quadri

SN Quinn

L Raynard

L Rizzuti

J Robertson

F Salvaggio

A Scholz

R Sfair

AMS Smith

J Southworth

TG Tan

S Vanaverbeke

EO Waagen

CA Watson

RG West

OC Winter

PJ Wheatley

G Zhou


PDS 110 is a young disc-hosting star in the Orion OB1A association. Two dimming events of similar depth and duration were seen in 2008 (WASP) and 2011 (KELT), consistent with an object in a closed periodic orbit. In this paper, we present data from a ground-based observing campaign designed to measure the star both photometrically and spectroscopically during the time of predicted eclipse in 2017 September. Despite high-quality photometry, the predicted eclipse did not occur, although coherent structure is present suggesting variable amounts of stellar flux or dust obscuration. We also searched for radial velocity (RV) oscillations caused by any hypothetical companion and can rule out close binaries to 0.1Ms. A search of Sonneberg plate archive data also enabled us to extend the photometric baseline of this star back more than 50 yr, and similarly does not re-detect any deep eclipses. Taken together, they suggest that the eclipses seen in WASP and KELT photometry were due to aperiodic events. It would seem that PDS 110 undergoes stochastic dimmings that are shallower and of shorter duration than those of UX Ori variables, but may have a similar mechanism.


Osborn, H., Kenworthy, M., Rodriguez, J., de Mooij, E., Kennedy, G., Relles, H., …Zhou, G. (2019). The PDS 110 observing campaign – photometric and spectroscopic observations reveal eclipses are aperiodic. Monthly Notices of the Royal Astronomical Society, 485(2), 1614-1625.

Journal Article Type Article
Online Publication Date Jan 29, 2019
Publication Date Jan 29, 2019
Deposit Date Jun 26, 2019
Publicly Available Date Jun 26, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 485
Issue 2
Pages 1614-1625


Published Journal Article (9.7 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society.

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