Questions tagged [light-curve]

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5
votes
1answer
127 views

What caused instant jumps and exactly flat periods in Kepler's light curves?

Last 65 days of Kepler's light curve for the infamous KIC 8462852 star is shown below from the published paper's graph. Skip the dips here, I wonder about two other features: Day 1559, during a ...
4
votes
2answers
171 views

Get orbital period of exoplanet from light curve using astropy.timeseries

I am using astropy and I would like to calculate orbital period of an exoplanet by its star's light curve. I follow tutorial in astropy docs and I use data from Kepler in Nasa Exoplanet Archive. ...
4
votes
2answers
92 views

Classification and discovery of stars

How do astronomers find the difference between a 'Cephid Variable Star' and distinct normal stars with opaque objects blocking it's light, like stars with planets revolving around them while both ...
3
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0answers
276 views

How does the size of a naked black hole effect its photon sphere?

What effect does the size of a black hole have on the size or density of the photon sphere and it's proximity to the horizon? For example: A person is in space looking at 2 black holes, one of them ...
2
votes
1answer
51 views

Converting Light curve to Luminosity

So I'm currently working around a specific variable star, α Ori and I want to determine it's luminosity...I do only have the light curve (driven from V-optical photometric band - Johnson V from AAVSO)....
2
votes
1answer
59 views

Pair together light curve and radial velocity data of specified star

I would like to create a web application that works with light curves and radial velocities of stars with exoplanets. I found a NASA bulk data download with both light curves and radial velocities (it'...
2
votes
1answer
64 views

What are these data in light curve generator

I'm generating light curves for some variable stars on the AAVSO website (see https://www.aavso.org/lcg ) . I can choose what type of data must be plotted. Can you explain what they are? Thank you in ...
2
votes
2answers
782 views

Python: Find brightest pixel in fits-file and ignore brighter artefacts

I have 4000 fits-files images from SPITZER, each containing the same star over a time period. Each image is a photmetry cube of 32 pixel * 32 pixel * 64 consequent time frames. I need to look through ...
2
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0answers
30 views

How to model blazar light curves

I have SED data spanning over a couple of days and I'm able to find the parameters of the SED (R, B, break energy,...) using least squares method. My question is how to model light curves (with t_acc, ...
2
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0answers
43 views

A basic question about light curves

I'm new here, so if I've done anything wrong, please let me know. I've been taking a look at some photometry data collected from TESS, and I encountered this light curve: (please ignore the blue and ...
2
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0answers
23 views

Finding the precession period of folded light curves

I was supposed to find the precession of a certain frequency in a time series. I tried breaking down the time series into smaller intervals and folded them over the average frequency I'm interested in....
2
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0answers
64 views

Depth of primary and secondary minimum in a light curve

How can I explain approximately the same depth of primary and secondary minimum in light curve? I observe star HD 36486. I tried filters MOST and BRITE. Is it related with photometric filter? When ...
2
votes
1answer
98 views

Comprehensible full manual for bolometric light curve reconstruction

Could anyone point me to some manual or tutorial, possibly step-by-step one, on reconstruction of (quasi-) bolometric light curve using UBVRI-photometry data? Both links and names are fine for me.
1
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1answer
68 views

Could Tabby's star be beamed by a neutron star's jet causing irregular star spots?

There have been some other questions here about what might cause the light curve dips of star KIC 8462852 as observed by Kepler Space Telescope. Here's one I haven't heard before: Could it be that a ...
1
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1answer
55 views

Where can I download processed data of the Kepler telescope?

I search for lightcurve Kepler data: time $t_i$, flux $F_i$ and measurement uncertainties $\sigma_i$ I need processed data (after removing trends, normalized, etc.). Where can I find it?
1
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1answer
78 views

Calculate depth and duration of exoplanet's transit using Python, astropy or lightkurve

I am creating a program for the analysis of exoplanets in Python using Astropy and Lightkurve libraries. I have light curve of specified star and I would like to calculate depth and duration of planet ...
1
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1answer
30 views

How to recognize exoplanet transit

I am using Python package lightkurve for exoplanets searching by the transit method. When I download light curve of some star and apply periodogram, I find frequency and power of periodic components ...
1
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2answers
29 views

How can I estimate the initial luminosity of a SNIa given initial mass of Ni-56?

The initial portion (and peak) of a SNIa's light curve is powered by the $\beta$-decay reaction: $$ ^{56}Ni \rightarrow ^{56}Co + e^+ + \nu_e + \gamma $$ Supposing we know how much Ni-56 is created in ...
1
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2answers
53 views

How Can I interpret this particular light curve without reading data on the side

There is only one dip in flux recorded. How can I interpret this particular light curve and find planetary radius https://exo.mast.stsci.edu/exomast_planet.html?planet=55Cnce
1
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0answers
40 views

How to decide which part of the data is analyzed? [closed]

I need to get the X-ray light curve of Classical Nova V1494 Aquilae (1999 No. 2) in Outburst. It is done long time ago, but I need to this by myself. While reading the papaer about the V1494 Aquilae, ...
1
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0answers
90 views

Sinusoidal Light curve of an eclipsing binary

This light curve seems really weird to me, I'm used to seeing light curves where the barycenter is a straight line. It either stays at a place, moves at a constant speed or slowly increases its speed. ...
1
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0answers
168 views

Photometry data from Gaia

I am trying to get data from Gaia. Especially for Cepheids or RR Lyrae. On Gaia websites it say they have released some of the data however I cannot find it. I am looking for two columns with time and ...
1
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0answers
80 views

Where can I find detail on interpreting the exo-planet transit-data graphics used in the Zooniverse Project?

I'm participating in the Zooniverse Exoplanet-explorers project (transit method), which provides only minimal guidance on interpreting their light curve and transit data graphics, as visible here: ...
0
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1answer
55 views

Plot SuperWasp Lightcurves

I am trying to plot superwasp lightcurves in python from the fits files, using TMID and FLUX2, getting this: There is a way to transform the information so I can plot the lightcurves with the kepler ...
0
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0answers
35 views

Binned of phase-folded light curve

How I can bin a magnitude phase-folded lightcurve? I take mean values magnitudes and it's uncertainties but this is wrong.