Long-term infrared variability of the UX Ori-type star SV Cep

A. Juhász, T. Prusti, P. Ábrahám, C. P. Dullemond

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We investigate the long-term optical-infrared variability of SV Cep and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 μm wavelength range. Following a careful data reduction, the infrared light curves were correlated with the variations of SV Cep in the V band. A remarkable correlation was found between the optical and the far-infrared light curves. In the mid-infrared regime, the amplitude of variations is lower, with a hint for a weak anticorrelation with the optical changes. In order to interpret the observations, we modelled the spectral energy distribution of SVCep assuming a self-shadowed disc with a puffed-up inner rim, using a two-dimensional radiative transfer code. We found that modifying the height of the inner rim, the wavelength dependence of the long-term optical-infrared variations is well reproduced, except the mid-infrared domain. The origin of variation of the rim height might be fluctuation in the accretion rate in the outer disc. In order to model the mid-infrared behaviour, we tested adding an optically thin envelope to the system, but this model failed to explain the far-infrared variability. Infrared variability is a powerful tool to discriminate between models of the circumstellar environment. The proposed mechanism of variable rim height may not be restricted to UXOR stars, but might be a general characteristic of intermediate-mass young stars.

Original languageEnglish
Pages (from-to)1242-1252
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume374
Issue number4
DOIs
Publication statusPublished - Feb 2007

Fingerprint

rims
stars
light curve
wavelength
general characteristics
Infrared Space Observatory (ISO)
radiative transfer
data reduction
spectral energy distribution
extremely high frequencies
observatory
wavelengths
accretion
envelopes
monitoring
energy

Keywords

  • Infrared: stars
  • Planetary systems: protoplanetary discs
  • Stars: individual: SV Cep
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Long-term infrared variability of the UX Ori-type star SV Cep. / Juhász, A.; Prusti, T.; Ábrahám, P.; Dullemond, C. P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 374, No. 4, 02.2007, p. 1242-1252.

Research output: Contribution to journalArticle

Juhász, A. ; Prusti, T. ; Ábrahám, P. ; Dullemond, C. P. / Long-term infrared variability of the UX Ori-type star SV Cep. In: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 374, No. 4. pp. 1242-1252.
@article{a6d058a8790344af84e1d2b3b2011851,
title = "Long-term infrared variability of the UX Ori-type star SV Cep",
abstract = "We investigate the long-term optical-infrared variability of SV Cep and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 μm wavelength range. Following a careful data reduction, the infrared light curves were correlated with the variations of SV Cep in the V band. A remarkable correlation was found between the optical and the far-infrared light curves. In the mid-infrared regime, the amplitude of variations is lower, with a hint for a weak anticorrelation with the optical changes. In order to interpret the observations, we modelled the spectral energy distribution of SVCep assuming a self-shadowed disc with a puffed-up inner rim, using a two-dimensional radiative transfer code. We found that modifying the height of the inner rim, the wavelength dependence of the long-term optical-infrared variations is well reproduced, except the mid-infrared domain. The origin of variation of the rim height might be fluctuation in the accretion rate in the outer disc. In order to model the mid-infrared behaviour, we tested adding an optically thin envelope to the system, but this model failed to explain the far-infrared variability. Infrared variability is a powerful tool to discriminate between models of the circumstellar environment. The proposed mechanism of variable rim height may not be restricted to UXOR stars, but might be a general characteristic of intermediate-mass young stars.",
keywords = "Infrared: stars, Planetary systems: protoplanetary discs, Stars: individual: SV Cep, Stars: pre-main-sequence",
author = "A. Juh{\'a}sz and T. Prusti and P. {\'A}brah{\'a}m and Dullemond, {C. P.}",
year = "2007",
month = "2",
doi = "10.1111/j.1365-2966.2006.11208.x",
language = "English",
volume = "374",
pages = "1242--1252",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - Long-term infrared variability of the UX Ori-type star SV Cep

AU - Juhász, A.

AU - Prusti, T.

AU - Ábrahám, P.

AU - Dullemond, C. P.

PY - 2007/2

Y1 - 2007/2

N2 - We investigate the long-term optical-infrared variability of SV Cep and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 μm wavelength range. Following a careful data reduction, the infrared light curves were correlated with the variations of SV Cep in the V band. A remarkable correlation was found between the optical and the far-infrared light curves. In the mid-infrared regime, the amplitude of variations is lower, with a hint for a weak anticorrelation with the optical changes. In order to interpret the observations, we modelled the spectral energy distribution of SVCep assuming a self-shadowed disc with a puffed-up inner rim, using a two-dimensional radiative transfer code. We found that modifying the height of the inner rim, the wavelength dependence of the long-term optical-infrared variations is well reproduced, except the mid-infrared domain. The origin of variation of the rim height might be fluctuation in the accretion rate in the outer disc. In order to model the mid-infrared behaviour, we tested adding an optically thin envelope to the system, but this model failed to explain the far-infrared variability. Infrared variability is a powerful tool to discriminate between models of the circumstellar environment. The proposed mechanism of variable rim height may not be restricted to UXOR stars, but might be a general characteristic of intermediate-mass young stars.

AB - We investigate the long-term optical-infrared variability of SV Cep and explain it in the context of an existing UX Ori (UXOR) model. A 25-month monitoring programme was completed with the Infrared Space Observatory in the 3.3-100 μm wavelength range. Following a careful data reduction, the infrared light curves were correlated with the variations of SV Cep in the V band. A remarkable correlation was found between the optical and the far-infrared light curves. In the mid-infrared regime, the amplitude of variations is lower, with a hint for a weak anticorrelation with the optical changes. In order to interpret the observations, we modelled the spectral energy distribution of SVCep assuming a self-shadowed disc with a puffed-up inner rim, using a two-dimensional radiative transfer code. We found that modifying the height of the inner rim, the wavelength dependence of the long-term optical-infrared variations is well reproduced, except the mid-infrared domain. The origin of variation of the rim height might be fluctuation in the accretion rate in the outer disc. In order to model the mid-infrared behaviour, we tested adding an optically thin envelope to the system, but this model failed to explain the far-infrared variability. Infrared variability is a powerful tool to discriminate between models of the circumstellar environment. The proposed mechanism of variable rim height may not be restricted to UXOR stars, but might be a general characteristic of intermediate-mass young stars.

KW - Infrared: stars

KW - Planetary systems: protoplanetary discs

KW - Stars: individual: SV Cep

KW - Stars: pre-main-sequence

UR - http://www.scopus.com/inward/record.url?scp=33846437038&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33846437038&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2966.2006.11208.x

DO - 10.1111/j.1365-2966.2006.11208.x

M3 - Article

AN - SCOPUS:33846437038

VL - 374

SP - 1242

EP - 1252

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -